Hello Deb;
Head for the Matre'D just as soon as you board the ship. The longer you wait, the longer the line of folks who would like a change, or to check on their table. I'll bet he/she will be able to help you.
Happy Sailing
Ken
My wife & I were on the Glory March of this year. We ask for table for two the first nite. Got it. The only problem, which it was not a problem for us was you are in the middle of all the traffic.