answer: #Person1# asks #Person2#, a taxi driver, to get to the Battery Park before 4, and #Person1# pays $20.
documents: #Person1#: Taxi. 
  #Person2#: Get on, pls. Where do you wanna go? 
  #Person1#: Thank you. Pls hurry, I am late. Can I get to the Battery Park before 4? 
  #Person2#: All right, Miss. I think we will get there if there are no delays on the way. 
  #Person1#: How exactly do you figure out the car fare? 
  #Person2#: According to the kilometer rate, the first five kilometers are 4 dollars and every kilometer extra costs 50 cents. 
  #Person1#: Oh, I see. 
  #Person2#: Here we are, Miss. 
  #Person1#: Thank you. How much do I owe you? 
  #Person2#: You owe me 19 dollars. 
  #Person1#: That's 20 dollars. Keep the change! 
  #Person2#: Thank you!