A service we can't provide

Me: Downtown library information desk, how can I help you?
Caller: Hi, if I tell you about a book, can you tell me whether or not you have it?
Me: I sure can! Do you know the author or the title?
Caller: The title is "Jason and the Argonauts." I don't think I know the author, though...
Me: Okay, I think I see it. Is it a kid's book?
Caller: Yeah? I'm in seventh grade, and I was just reading it at school?
Me: Okay. Do you remember what the cover looks like?
Caller: Yeah, it had a ship on the cover.
Me: Is it blue with purple writing?
Caller: Yeah, maybe.
Me: Well, we do have a copy here. We can put it on hold for you, and if it turns out this one isn't the one you wanted we can see if we can borrow it for you from another library. Do you have your library card with you?
Caller: No, I don't.
Me: Well, did you just want to know whether we owned it or not, or were you thinking you would come in and pick it up soon?
Caller: Well, uh, I was thinking of coming in to get it, but I don't know...uh, how does it work? Can the library email me the book?
Me: ...um, no, sorry, we can't do that.