He was undoubtedly going to slip up sooner or later and give his actual name, but it would be a solid effort while he tried.

"Thank you, but I'd hate to trouble you. Still," if you're offering "I can't say I have any idea what I'm supposed to do. I've never attended classes--not proper classes, anyway--so this is all a bit new to me."

A frown. "How long is 'a while,' though?"