[The place is only half-full when they enter, with a nice booth calling out to them. But before they're even sat, Zatanna turns to them--'them' meaning Wally]
I need to visit the little magician's room. If the server comes before I get back, just order me a glass of water, alright?
[With that, she takes off in the general direction of the restroom, leaving the boys to fend for themselves.]