answer: Lily and Joey wish each other a merry Christmas. Joey tells Lily how American people celebrate Christmas.
documents: #Person1#: Merry Christmas, Lily.
  #Person2#: The same to you, Joey.
  #Person1#: This is your first Christmas in the US. Here is the gift for you.
  #Person2#: It's very thoughtful of you. Wow, it is so beautiful. Could you tell me how American people celebrate Christmas?
  #Person1#: Ok. People decorate their houses, place a Christmas tree in the room and maybe sing a Christmas carol together.