answer: John asks Bob to return his book. Bob is sorry for the delay.
documents: #Person1#: Hi, Bob. Can I have the book back I lent to you last month?
  #Person2#: Oh! I forgot all about it. Of course you can have it back, John. I'm sorry about the delay.
  #Person1#: Well, it doesn't matter. I almost forgot it too if it is not for Peter who asked me about it this coming.