answer: #Person2# tells #Person1# that #Person2# tipped the bellboy $3. #Person2# thinks the tip gave to the cab driver was too much, while #Person1# doesn't think so. #Person1# suggests no tip for the dinner.
documents: #Person1#: Did you tip the bellboy? 
  #Person2#: Yes, but I don't think it was enough. He looked disappointed. I gave him three dollars. 
  #Person1#: That sounds about right to me, fifty cents a bag. If they think you don't know better, they'll try to get more. 
  #Person2#: It's the same in Kauloon. But I definitely think we over-tipped the cab driver. The fare was twenty dollars, and you gave him a five-dollar tip. That's twenty-five percent of the total! Too much! 
  #Person1#: I disagree. He was polite and informative, and he drove smoothly. One should reward good service. 
  #Person2#: I'll sign for dinner and charge it to our room. Let's see. The bill is one hundred dollars. That seems reasonable. How much tip should I leave? 
  #Person1#: Remember last month when we were in Europe? Maybe Californians use that same system they add the waiter or waitress into the bill, so you don't have to leave anything extra.