Fix(booking-model): Fix booking response transformer

backend/internal/ktmtrainbot/bookingmodel.go

@@ -77,6 +77,7 @@ func (env *Env) NewBookingResponse(model *Booking) *BookingResponse {
 		Passport:       model.Passport,
 		PassportExpiry: model.PassportExpiry,
 		Contact:        model.Contact,
+		BackToSg:       model.BackToSg,
 		Status:         model.Status,
 	}