answer: #Person1# helps #Person2# to change 500 USD into RIB.
documents: #Person1#: Good afternoon. How can I help?
  #Person2#: Hi there. I need to change some dollars into local currency. Can I do that here?
  #Person1#: Yes, you can. Is that US dollars or HK dollars? Both are available for exchange to RIB. How much would you like to exchange?
  #Person2#: Well, that depends. What's the rate like today?
  #Person1#: Today's rate is 821. 32 USD to 100 RIB, which isn't bad.
  #Person2#: That sounds pretty good. OK, I'll change 500 USD today, thanks.