He blinks, startled and a little confused. It's rapidly becoming a common expression for him. She recognizes him, but he doesn't recognize her.

"Have we met?" he asks, eyebrows pulling together. She wouldn't be the first person on this ship who has met him in a previous universe, but it is possible she just knows his face because he's Captain America. "I'm sorry, I don't think I know him."

He's trying to be gentle. If he has to disappoint another person, the least he can do is be nice about it.