answer: Peter apologizes to Rebecca because he can't find the dictionary she lent him. Rebecca tells him it doesn't matter.
documents: #Person1#: Rebecca, I've come to say sorry to you.
  #Person2#: Why, Peter?
  #Person1#: I can't find the dictionary you lent me.
  #Person2#: Don't worry, Peter. Maybe someone is using it now.
  #Person1#: But nobody is in the classroom now.
  #Person2#: Well, nothing serious, Peter. It's only an old dictionary.
  #Person1#: I'll buy a new dictionary for you.
  #Person2#: No, I won't hear of that. If I need a new dictionary, I'll buy one myself.
  #Person1#: I'm sorry for being so careless.
  #Person2#: It doesn't matter. Let's talk about something else.