When you book the reservation it says "You must cancel at least one day prior to your reservation to avoid a per person cancellation fee. If you fail to cancel or are a no show, the credit card provided at the time of reservation will be charged $10.00 per person." I've asked several different CMs what "one day prior" means and I've gotten a range of answers. The most common answer is that you must cancel it the day before the reservation (e.g., if the reservation is on Tuesday, you must cancel it on Monday). Others have said you must cancel 24-hours before the reservation (so if the reservation is at 10:00 am on Tuesday, you must cancel by 10:00 am on Monday).