I have created a javascript function to do some validation in another entity. The validation is working but I am trying to return false to the main function from inside function, I am new in dynamics 365 framework and in javascript

the code:

function SubmitAction(executionContext) {
var formContext = executionContext.getFormContext();
var userSettings = Xrm.Utility.getGlobalContext().userSettings;
var languageCode = userSettings.languageId;
var isAirportValis = ValidateAirportCountry(executionContext);
var IsConfidential=formContext.getAttribute("alfa_confidentialguest").getValue();
var a = true;

//Edit by Abdallah To get the package Type so we can get the package type
var lookupItem = formContext.getAttribute("alfa_member").getValue()[0].id;
var theTotalMembersTravling = formContext.getAttribute("alfa_numberofdependent").getValue();
var remainFlightCredit;

debugger;
Xrm.WebApi.online.retrieveRecord("contact",lookupItem, "?$select=new_remainstravelcredit").then(
     function employessPackage(result) {
        var new_remainstravelcredit = result["new_remainstravelcredit"];
        if(new_remainstravelcredit !== null){
        if(new_remainstravelcredit > 0)
        {
            remainFlightCredit = new_remainstravelcredit;
            console.log(remainFlightCredit+" This not inside any if condition");

                    var newRemain = (parseInt(remainFlightCredit)) - (parseInt(theTotalMembersTravling));
                    console.log(newRemain+ " This in the remain if condition");
                    var entity = {};
                    entity.new_remainstravelcredit = newRemain.toString();
                    Xrm.WebApi.online.updateRecord("contact",lookupItem, entity).then(
                    function success(result) {
                        var updatedEntityId = result.id;
                    },
                    function(error) {
                        Xrm.Utility.alertDialog(error.message +" This error is occuring from retriveing the altanfeethi emplyees packgae");
                    }
                );
        } if(new_remainstravelcredit <= 0)
        {
            Xrm.Utility.alertDialog("You have exceeds the travel credit");
            return false;
          //  throw Xrm.Utility.alertDialog("You have exceeds the travel credit");

        } 
    }
    },
    function(error) {
        Xrm.Utility.alertDialog(error.message);
    }
);



if (!isAirportValis) {
    return false;
}
//var isAttachemntValid = ValidateAttachments(formContext);
//if (!isAttachemntValid) {
//    return false;
//}

var hasTravellers = ValidateTravellers(formContext)
if (!hasTravellers && !IsConfidential) {
    var userSettings = Xrm.Utility.getGlobalContext().userSettings;
    var languageCode = userSettings.languageId;
    if (languageCode == "1033") {
        alert(Messages.FlightMemberCountValidation1033);
    }
    else {
        alert(Messages.FlightMemberCountValidation1025);
    }
    return false;
}


var isGuestValid = isValidGuest(formContext);
var isPaymentValid = false;
var guestPaymentType = formContext.getAttribute('alfa_guestpaymenttype').getValue();
var addedGuestServices = formContext.getControl('guestservices').getGrid().getTotalRecordCount();
if (!isGuestValid) {

    var membershipType = GetMembershipType();
    if (membershipType != MembershipTypeEnum.Corportate) // Individual
    {
        formContext.getControl('alfa_guestpaymenttype').setVisible(true);
        formContext.getAttribute('alfa_guestpaymenttype').setRequiredLevel('required');

        if (!guestPaymentType) {
            if (languageCode == "1033")
                alert(Messages.IndividualGuestSub1033);
            else alert(Messages.IndividualGuestSub1025);
            formContext.getControl('alfa_guestpaymenttype').setFocus();
            return false;
        }
        else if (guestPaymentType == GuestPaymentTypeEnum.BuyPackage) {
            if (addedGuestServices == 0) {
                if (languageCode == "1033")
                    alert(Messages.AddGuestService1033);
                else alert(Messages.AddGuestService1025);
                formContext.getControl('guestservices').setFocus();
                return false;
            }
            else isPaymentValid = true;
        }
        else if (guestPaymentType == GuestPaymentTypeEnum.PayForAdded)
            isPaymentValid = true;
    }
    else  // Corp
    {
        formContext.getControl('alfa_guestpaymenttype').setVisible(false);
        //var addedGuestServices = formContext.getControl('guestservices').getGrid().getTotalRecordCount();
        // if (addedGuestServices == 0) {
        if (languageCode == "1033")
            alert(Messages.AddGuestService1033);
        else alert(Messages.AddGuestService1025);
        formContext.getControl('guestservices').setFocus();
        return false;
        // }
        //else isPaymentValid = true;
    }
    if (isPaymentValid) {
        formContext.getAttribute('alfa_requirepayment').setValue(true);
        formContext.getAttribute('alfa_issubmitted').setValue(true);
        formContext.data.save();
    }

}

else {
    formContext.getAttribute('alfa_requirepayment').setValue(addedGuestServices > 0);
    formContext.getControl('alfa_guestpaymenttype').setVisible(false);
    formContext.getAttribute('alfa_guestpaymenttype').setRequiredLevel('none');     
    formContext.getAttribute('alfa_issubmitted').setValue(true);
    formContext.data.save();
 }


}

In the line where the if condition checking "if(new_remainstravelcredit <= 0)" I want to return false from the main function "SubmitAction" but it does not work as when it goes inside the if condition if(new_remainstravelcredit <= 0) it then resume with the main function implementation. Any suggestions on how can I enforce to return false and exit the SumbitAction function from the inner function emploessPackage