Is it possible to modify an award reservation to remove a few nights even if the award room is no longer available to redeem? Basically, I need 5 nights, but I don't know the dates yet so I booked a 10 night reservation. Now, some of the nights are no longer available for redemption and I am unable to modify my reservation online. Phone agent says that she can do it, but I'm a bit worried about her canceling my entire reservation just to find out that she can't book the 5 night award.