answer: #Person2# is checking in. One of #Person2#'s carry-on items, a tripod, will be stored by #Person2#'s stewardess because it does not fit under the seat or the overhead bin.
documents: #Person1#: Will you be checking in any baggage today?
  #Person2#: Yes, I have two large suitcases and one box.
  #Person1#: If you need baggage tags, they are found in the box on your right.
  #Person2#: No, thank you. They are already tagged with my name and address.
  #Person1#: You are allowed an additional two carry-on items.
  #Person2#: Good, I have my backpack and my camera tripod.
  #Person1#: I see. All carry-on items must be able to fit under the seat or in the overhead bin.
  #Person2#: Both my items will fit under the seat or in the overhead bin.
  #Person1#: You will need to send the tripod as luggage because it is too long to fit in our gauge box for carry-on items.
  #Person2#: I cannot let anything happen to that tripod. Can you guarantee it will not be damaged if I check it in?
  #Person1#: No, I can't. Perhaps your stewardess will help you to find a place to store it.
  #Person2#: Good idea. I will ask the stewardess to help me store my tripod.