About a week ago I had a Who's on First-style discussion with Saul, whose job it is to help me with class-related issues. You can read the original conversation here.
Saul: Oh hey, Christense, I found out that you probably do need a specific textbook for that IELTS class.
Me: Great, what is the name of the textbook?
Saul: Sorry, I don't know.
Me: How can I buy the textbook if I don't know the name?
Saul: Yeah. I'll try to find out for you.
Me: The class manager at the IELTS center could probably tell you.
Saul: Yeah, I should go back and ask him again.
Me: I happened to be at the IELTS center this morning. I talked to the class manager myself, and he said there is no textbook for that class.
Saul: Oh. Really?
Me: Yes. So you don't need to bother talking to him "again."
Saul: (Sincere) Great. Let me know if there's anything else I can help you with.
Me: I sure will.