[ He realizes now that he's kept her from exploring her own space. It was just meant to be a friendly greeting, how do you do, do you know me? and now they're talking about memories and people that should be in them and he feels bad for holding her up. He probably would have lost patience with that sooner than she's doing right now. ]

Spots that should be filled? [ That's one thing he knows very well. He doesn't remember anything, but he knows there's plenty of people in his past. Family. People he should know. He doesn't. That's an ache he's already familiar with, one that's never left. This new feeling isn't quite the same but it's close and he realizes he's getting anxious about that empty space in his house. ] You should probably check inside.

See if there's anyone there. Or... evidence that other people live there, anyway.