answer: #Person1# asks about #Person2#'s date of leaving and return for the holiday.
documents: #Person1#: When do you leave for holiday?
  #Person2#: On the twentieth. We're flying. The flight takes seven and a half hours.
  #Person1#: And when are you back?
  #Person2#: On the twenty-eighth. I will give you a ring when we're back.