answer: Cindy tells Brian to celebrate Cindy's birthday on Friday afternoon.
documents: #Person1#: Cindy. We were going to try to surprise you for your birthday. But you ' re just too busy! Can you tell me when you ' ll be free?
  #Person2#: Oh, Brian. That ' s really sweet of you guys. I would love to get together with all of you. How about Friday?
  #Person1#: Great! What time?
  #Person2#: I ' m free all afternoon. Why don ' t we meet at 1 o ' clock in the lobby?