[He frowns for a second, before he realizes why it might be that she doesn't make the connection right away -- after all, if she's from the future, then...]
Well, dunno how far from the future you are, ma'am, but... you might know him better as Captain America. [He can't help making a slight face as he says that, because while it was easy to get used to the uniform and all, the name will never, ever feel right to him -- because Captain America is an ideal, a legend that represents people's hopes... but Steve's just Steve to him, always. He never had to be anything else.]