May I help you?
Give me a Big Mac, a small order of French fries and a medium Coke.
You'll need to wait a few minutes for the fries. They are still in the fryer.
That's fine.
Your total comes to $ 7.
Here's a twenty. Could you give me some more napkins?
Sure. Your cash back is $ 13. And we'll bring out your fries in two minutes.
Thanks.