dialogue: Ros: Excuse me. Have you got any books on genetic engineering? I've looked for them everywhere, but I can't find any.
  Milli: 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.
  Ros: What a pity! I should have come earlier.
  Milli: Come some time next week if you like. I think we'll have got some by then.
  Ros: Ok, I will.
summary: Ros wants books on genetic engineering. Milli says they're sold out and asks Ros to come next week.