Getting ressies same day for Dine with Shamu

[cantwait101]

Anyone know the chances of getting a same day ressie for dinning with Shamu? We are going in a few weeks and I have two day's that we may possibly do Sea World but it will be dependent on the weather so I have no real idea which day we will be going.
We loved this the last time we were there several years ago and with the price drop it is def something we would consider this trip!