I also got two conflicting answers. The first time I called and asked a CM she told me that you couldn't make two dinner adr's because the computer would recognize it and cancel each other out. I just called before because now a friend of mine wants to meet us at O'hana for dinner - I wanted to add her family of 4 onto my adr. I wanted to know what would happen if my friend doesn't show up (she has a habit of doing that) because I don't want to miss out on my adr. The CM told me that she would make a new adr in my friends name, keep my old adr, but I would have to cancel one soon because the computer MAY cancel both of them out.
Has anyone had an adr for say, 8 people, then show up w/only 4? What has happened in that situaiton?