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