I might be cranky

Customer: I'm looking for a book about a family that had a tragedy it's fairly new.
Me: Do you know anything more about it? I'm afraid that's not ringing any bells.
Customer: Someone died I think.
Me: A new book about a family where someone dies?
Customer: Yes.
Me: I'm sorry, I really don't know what title you might be looking for. It's just too broad.
Customer: Well, you work in a bookstore. You should know the books that are out.

Now, I was polite and apologetic even to this woman....
However.
How is it my fault that you don't have a CLUE about what it is that you want? I mean, we try to find things for people all day with no information and most of the time we're happy to do it but there is NO reason for you to get nasty if we can't get our ESP working that day.