We have found on the Spirit and the Pride, they will not assign a table for to in advance. You have to go to Maitre'D when you get on board. At least that is what they tell you. If you request a certain table number they will give it to you. Our cruise next week have our assigned table number on the paperwork, we will of course check this out when we board.
The other thing that requesting a table number does for us is assure that we are not in the very aft section of the Spirit Class Ship. They tend to be a little noisy.
BTW congratulation on your 30th!! Hope you enjoy your cruise.