answer: #Person1# and #Person2# are going to New York City. #Person1# tells #Person2# the Big Apple is the nickname of New York and the reason behind.
documents: #Person1#: Are you ready for the trip to the Big Apple?
  #Person2#: The Big Apple? What are you referring to?
  #Person1#: Don't you know? The Big Apple? Is the nickname for New York City. You're going to New York with us, aren't you?
  #Person2#: Yes, I'm going. I'm really looking forward to seeing an exhibition of a modern American painter there, but I'm wondering where the nickname came from.
  #Person1#: Some musicians in the nineteen twenties gave it the name when they played a concert in New York. The musicians called it the Big Apple.
  #Person2#: Amazing. New York is such an interesting place and it even has an interesting nickname.