Woman: Hi, I checked out a cookbook on French cooking and I returned it. I was wondering if it would still be here.
Me: Do you know the title or the author?
W: No. It was 25 years ago. I just thought it might be on the shelf.
I give her the call number for French cooking and tell her that if we have it, it would be on that shelf.
W: I'm confused. Do you have it or not?
Me: I can't tell you without a title or author. The books on French cooking are in that area over there. It's unlikely that it would still be in circulation after 25 years though- books are lost, stolen, never returned, damaged, etc.
W: I'll come back when I have more time to brainstorm.