Charles makes a little face, which can approximately be summarised as 'this place, what are you going to do about it,' followed by, "Same old, same old."

As he takes a seat of his own, he picks up on the lack of recognition and feigns lack of memory himself. "Surgery, right? Doctor Wander? I'm Doctor Xavier, the genetic counselor in the Family Clinic. Well, Charles." They're not about to refer to one another by title, after all.