As he requested food Riza realised she'd have to deal with him for a while longer before she could introduce him to Roy and leave them to it. Roy was definitely more of the people person than she was, mostly anyway. She did seem to get on with the Elric's more though Ed wasn't always trying to wind her up like he did Roy. And she had close friends but she wasn't one to socialize much. Unless it was with Roy or the boys which some didn't consider to be socializing.
"Sure" she said with a small smile, "There's a sandwich place just down here" she pointed, "Unless you want something in particular?" she added as she realized she had no idea what he would want.