I recently booked a ticket with Flight Flex (option to change flight once subject to fare increase) along with Big Front Seat (gotta have to have those on longer flights).

I just saw a more favorable departure with fare going down and tempted to pull the trigger. However, the segment didn't ask me what seat I will get on so I held off.

Any prior user with DP that your new reservation will also have Big Front Seat assigned automatically to the new flight? I just don't want to change my flight with the BFS lost.