answer: #Person1# wants to smoke but #Person2# reminds #Person1# that smoking is not allowed here.
documents: #Person1#: Excuse me. Is anyone sitting here? 
  #Person2#: No, nobody. 
  #Person1#: You don't mind if I smoke, do you? 
  #Person2#: Well, to be frank, yes, I do. 
  #Person1#: Oh, I'm sorry. But this isn't a no-smoker, is it? I mean would you mind if I smoke here? 
  #Person2#: Actually it is. Perhaps you haven't noticed the sign. 
  #Person1#: Sign? What's sign? 
  #Person2#: There, on the window. 
  #Person1#: Oh, sorry. I didn't notice it. Sorry. 
  #Person2#: That's all right.