answer: #Person1# buys a dozen red roses for $20 from #Person2#.
documents: #Person1#: I need to buy some flowers for my wife.
  #Person2#: Perhaps you'd be interested in red roses.
  #Person1#: What would the roses cost me?
  #Person2#: They're only $ 20 a dozen.
  #Person1#: I like the sound of that.
  #Person2#: Yes, that is today's sale price.
  #Person1#: A dozen will be fine.
  #Person2#: Is there anything else you'd like to get?
  #Person1#: No, thank you.
  #Person2#: These roses should make your wife very happy.