This is what I found - hope it helps
To book the Candlelight Processional Dining package you can call 407-WDW-DINE (407-939-3463). You must use a credit card when booking. You will not be charged until you actually dine at your selected restaurant. There is a 48 hour cancellation policy. If you are using one of the Disney Dining Plans, you will use 2 table service dining credits regardless of which restaurant you choose.