We are going to CRT for breakfast on 1/21 and had a reservation for 19 people (still can't believe that I somehow got that!). They charged my credit card in full for all 19 meals at the time of booking. Last week one of the kids broke his leg and so that family of 5 people is not going to be able to make it. I called Disney dining and they changed the reservation accordingly and gave me the $ amount that would be credited back to my card in 1-2 billing cycles. When I first made my resie, they told me that I had to cancel at least 24 hours prior to in order to be refunded. This will be the first time we have ever been able to get a reservation there and I am certainly no expert, but (as others have mentioned), I would definitely call back again and try to change the number of people without canceling it completely. That is just ridiculous!!!! Good Luck!