answer: #Person2# orders Bourbon with iced water and pays for it with #Person1#'s assistance.
documents: #Person1#: Good evening, sir. What can I do for you?
  #Person2#: Bourbon, please.
  #Person1#: How would you like your Bourbon, straight or on the rock?
  #Person2#: With iced water, please.
  #Person1#: Here you are, sir. Bourbon with iced water.
  #Person2#: Thank you. Now how much do I owe you?
  #Person1#: The bourbon is 15 dollars plus 10 % service charge. So the total is 16. 5 dollars.
  #Person2#: That is OK. Here is 20 dollars and you can keep the change.
  #Person1#: Thanks a lot.