He did make sure to take notes on that. This ship had a thousand mysteries, this 'Aang' person seemed to be yet another one of them.

"This is an incredibly huge ship, about the size of a small country. If he's stuck in another part of the ship, he could be miles away, and no one can help him if they don't even know he's there." And speaking of knowing about him...

"How do you know he's on board? Just a gut feeling, or did he try to contact you somehow?"