Provide the theme summaries for the following conversation: 

Lily: Professor Davis, could you please borrow me the book you talked about on your last lecture? There is only one copy of it in the library and someone has already borrowed it.
Charlie: Hello, Lily! I am afraid I cannot help you - I do not own a copy of this book, I borrowed it form professor Roberts myself.
Lily: Thank you, I will ask professor Roberts than.
Charlie: Lily, have you submitted your paper? I cannot find it.
Lily: Yes, I have or at least I think I have. I will check it.
Lily: Professor Davis, I am so sorry, I was certain that I have done this. Could I submit my paper now?
Charlie: Yes, of course. :)
Lily: Thank you!
Lily: <file_other>
Charlie: You are welcome! Could you please remind your classmates to do the same? So far I have received only ten papers..
Lily: Yes, of course, I will do this.
Charlie: Thank you, Lily! By the way I have already read your paper. It is very well written and you made some really good points - it is an A+ work! :)
Lily: Thank you, Professor Davis! And once again thank you letting me submit it after the deadline.
Charlie: It is not a big deal. :) Nevertheless I would be really glad, if the rest of the students sent their papers to me soon.

Summary: 
Charlie can't lend Lilly the book she asked about, as he has himself borrowed it from prof. Roberts. Lilly forgot to submit her paper before the deadline, but Charlie allows her to do it now. Charlie is pleased with Lilly's paper. Lilly promises to remind other students about the paper. 