answer: #Person1# is looking for genetic engineering books, but they're sold out. #Person2# tells #Person1# to come next week.
documents: #Person1#: Excuse me. Have you got any books on genetic engineering? I've looked for them everywhere, but I can't find any.
  #Person2#: I'm not sure if we've got any now. Books of that kind are on this shelf. Well, I'm afraid we've sold out.
  #Person1#: What a pity! I should have come earlier.
  #Person2#: Come some time next week if you like. I think we'll have got some by them.
  #Person1#: Ok, I will.