Can I help you, sir?

Yes, I'd like a book about law.

Would you tell me the name of the book and the author?

Uh, the Origin of Law. And it's written by Professor Felix of Harvard.

I'm sorry. It's out of stock now. Could you come by again next week?

Next week? It is too late. I need it urgently.

Well, then, is it convenient to leave your phone number so that I can inform you as soon as we restock it?

No, thanks any way.

You're welcome.