Purple book guy: no, can't you put it aside for me when it comes in?
Me: Yes, that's why I need your card.
PBG asks me again if I can put it aside when it comes in.
Me: I'm not going to notice it when it comes in. There are hundreds of books that come in every day. So, if I place a request for you we can be sure that it will be set aside for you.
PBG: Oh, and walks away.