Not a book store!

I've actually had two different incidents like this. Patron calls with a title...I find the title in our system. I asked the patron if she wanted me to put the book on hold for her. She was totally taken aback, and said in a very animated voice that no she wanted to buy the book!! I explained that we don't sell our collection we borrow books out to people to read. She had no clue...and actually sounded as though she didn't believe me. I told her she would have to go to a bookstore to purchase the book. She asked where there was a bookstore, so I put a plug in for "Book World" here in DL. I somehow got the impression this particular patron doesn't read much!!?