I made our dining reservations for a December trip for 7 people and now grandma has decided to join us I've gone to the reservation and tried to click "change reservation" but it won't allow me to change from 7-8. Does anyone have a tip on how to do this, I sure hope I won't have to cancel all of my ADR's. Has anyone done this? Surely they'll let me add a chair to the table, any suggestions? I'm so worried!