Is it required to have a reservation in order to dine in?

No

Nope

No...if you don't you might have to stand in line until a table is ready. #houstonrealtoroutandabout

Dominic Guerrero, Not necessarily, there may be a wait for seating, due to Occupancy Ordinances set by The Fire Marshall and City of Houston and as Ray M stated. You'll definitely enjoy yourself, so it would be worth the wait.

I believe you can if you have a large party and a minimum $250 deposit is required. Their website has full details.