answer: #Person1# asks Fiona, who works in a restaurant, how to tip. Fiona tells #Person1# most people leave a 15% tip, but some tip 20% or even higher.
documents: #Person1#: Where do you work, Fiona?
  #Person2#: I work in a restaurant.
  #Person1#: Then you must know about how people tip very well. I came to this country just last week. I really don't know how to tip. Yesterday ordered a five dollar 95 cent beer, I gave the waitress $6. 00 and asked her to keep the change. She didn't give me a happy look.
  #Person2#: Well, you tipped too little. You should have left at least a 15% tip. That's a regular tip.
  #Person1#: Oh, I really tipped too little last time. Have you received such a low tip before?
  #Person2#: Sure. Some customers just leave such a low tip on purpose. What's worse, they expect quick service. It's really hard to accept.
  #Person1#: How do most people tip?
  #Person2#: Most people tip a 15% tip, but some tip 20% or even higher.
  #Person1#: Those must be your favorite kinds of customers.
  #Person2#: Sure. I am saving money for a car, so I really need better tips.
  #Person1#: Well, you can expect good tips form me.
  #Person2#: Thanks.