Dinosaurs don't read....now they're extinct...coincidence?

I was working the circulation desk yesterday and this young guy walked up to me and handed me a bunch of books.

Me: "Would you like to check these out?"

Patron: "No, I'd like to rent them!"

Then, while I was out shelving, this lady approached me.

Patron: "The last time I was here, a librarian recommended a book to me, but I can't remember what it was.  Do you remember?"

Me: "Do you remember which librarian helped you?"

Patron: "No."

Me: "Do you remember what she looked like?"

Patron: "I can't remember that either.  Don't you keep track of what you recommend somewhere?  Like a spreadsheet or something?"

Me *Mental facepalm*

I then spent almost ten minutes trying to explain that we can't feasibly keep such a record because we have hundreds of patrons coming through the library. 

She eventually walked off in a huff.