answer: Isabel and her father have been waiting for #Person3#. #Person3# shows up and apologizes for being late.
documents: #Person1#: I see you've brought something to occupy your time while we wait. Good. We may be here a long time. 
  #Person2#: Yes, Papa. I brought the catalog for the next college we're going to visit--the one in New Hampshire. 
  #Person1#: It's just that North Americans pay more attention to exact times. They're very punctual people. 
  #Person2#: I think that if you're more than thirty minutes late, you have to apologize and explain what delayed you. 
  #Person1#: Our appointment with this dean is for three-fifteen. My watch says three-thirty. I'm sure we're not late.
  #Person3#: Isabel? Come in. Sorry I kept you waiting. We're running a little behind schedule today.