What is the cancellation policy for Tomorrowland Terrace Dessert/Wishes Party?

[HermanTriplets+1]

Hi Forum,
I know I need to "pay in advance" for reservations for the Dessert Party, but is there still a cancellation policy? I am not sure whether we will be 3 or 4 for that night, and I wonder if I can reserve for 4 and cancel one if she doesn't stay. Thanks for your help on this...