answer: #Person1# is checking in with the help of #Person2#.
documents: #Person1#: Excuse me, miss. Should I check in here for taking MS121 to Florence?
  #Person2#: Yes, show me your ticket and passport please.
  #Person1#: Here you are. Can I have a seat in the back of the plane?
  #Person2#: No problem. Wish you a nice trip.