[He's starting to get the distinct feeling that he's being talked down to- but to be honest, he can't quite bring himself to care. She obviously knows more than him on the subject, so why resent that she's trying to help? Cullen tries to think on her question, though his expression isn't exactly one of recognition.]

You said... that this is a space ship, yes? We have sea ships. None that can move into the sky, but-

[He's trying. Cullen brushes a hand absently against the wall, frowning slightly at the smoothness of it- metal? Who would make walls out of metal? It doesn't make sense that something made of metal could sail through the sky, but if he's to believe her, then it does.]

The Qunari build their dreadnoughts with metal hulls. Like this, I think.