Ask me anything, I'm a Librarian!!

A young man, "Do you have any books on....".
Turns to his Dad, "What is it I like dad?",
Response, "Cars",
Young man to librarian, "Books about the ocean".
They go out to look for the books. Back at the Elevator,
Young man, "How could you forget I liked dinosaurs, dad", holding 3 dinosaur books "I like dionsaurs".