Breakfast in the Irving area
One morning, quite a few years ago, I had a small, very informal business meeting at the Local Diner - Belt Line @ 635. Since it's in the middle of multiple business complexes, it was filled with other business types. It may be too informal for what you need and also, I don't remember if all seating was booths or if they had tables that could be pushed together.
8305 N Belt Line Rd, Irving, TX 75063