Were you looking on the App? Dining with show packages can't be booked on the app, they only show up on the website. There isn't a guarantee that they can switch it for you but if the package shows availability for any AK restaurant for that day during any meal period that means they still have space in the theater. If they have multiple showings of ROL on the same day there may be availability for one show but not the other and there is a specific time frame they want you to eat by in order to be eligible for the ROL Package. If there are no open reservations at the restaurant you choose it won't show any availability for the ROL package at that restaurant either.