If you are not completely sure about a reservation, then I suggest you not order the certificate until you are sure. You can make a reservation both online or on the phone without taking out points. Once you decide you really do want your reservation, you can call and have the reservation agent pull your points and get you a cert (most of them will be e-certs now.) If you decide you don't want the reservation, then you can just cancel it. This way you don't have to worry about pulling/returning points at all.