You can cancel your dining reservation online. Please refer to the cancellation policy provided at the time of your booking and in your email confirmation. 

Restaurants offering advance reservations charge a per-person cancellation fee for reservations cancelled after the designated cancellation period, or for no shows. Each restaurant at Walt Disney World® Resort maintains its own cancellation policy, so be sure to confirm the policy before finalizing your reservation. For additional assistance, please call (407) 824-1391.