Hi Lesli!
You don't need to be too worried about your reservation number if you did receive a confirmed Dining Reservation for
T-REX by telephone. Reservations are stored in a computerized system and you'll check in according to your last name under which the reservation was placed at the restaurant.
That being said, you certainly would likely want to have your confirmation number on hand in case you should need to call in and cancel your reservation or make a change. It wouldn't hurt to give Disney Dining a call at (407) WDW-DINE and ask to have the number looked up so that you can notate it.
If you have a Magic Your Way Package with Resort Reservation and you made your reservation for T-Rex in conjunction with that resort reservation number, you may be able to retrieve your confirmation number online. Log into your online Walt Disney World account under
My Disney Vacation and check the 'Reservations' tab to see if it has been connected to your stay.
Wishing you a simply Magical time at Walt Disney World and a prehistorically good time dining at T-REX!
Kirsten