Originally Posted by
javabytes
If you want to do something like this - i.e. book a new reservation but don’t cancel the existing one until you have the new one confirmed - my suggestion is to do it quickly and with the help of a phone agent. They can temporarily prohibit the new booking from getting cancelled but you have to be actively working on canceling the old one.
That's definitely great advise but for now, the OP should consider alternative flights