Hi Lisa,
Cinderella's Castle is one of the toughest Advance Dining Reservations to make in all of Walt Disney World. I have tried to make reservations for my trips by calling at 6:55 am on three phones. Even then, I did not always get what I wanted.
Since it is less than 90 days to Thanksgiving, I am sure that the reservations for dinner are full. You can try calling 407-WDW-DINE and ask if anything is available.
If so, try some other great restaurants at Walt Disney World such as California Grill, Flying Fish, Artist Point, Whispering Canyon Cafe, Boma, Cape May Cafe, Le Cellier or any other of the great
restaurants at Walt Disney World.
I would also set up any other dining reservations at this time as well because the parks will be busy.
Have a magical vacation!
Beth