I booked bounceback with free dining in September for this September. Looking at my reservations I realize that I booked one less park day than I need. A few years ago I tried to upgrade my free QS to DDP and the two different CM's I talked to wanted to make a new reservation and charge me for the dining plan. Seems neither one knew how to make the change without adding a new reservation. I don't know the best time to call to get a knowledgeable CM to add another day to my tickets without changing anything else in my reservation.