answer: Bill is late and an ambassador is waiting. #Person1# and #Person2# assumes Bill overslept because he lives far away and commutes every day by train.
documents: #Person1#: Where's Bill? The ambassador is already here. The meeting is set to start at 9 am. 
  #Person2#: He's late again. Traffic is probably holding him up. You know, he commutes from the suburbs. It's not easy commuting every day. We should cut him some slack. 
  #Person1#: Even though the trafic is bumper-to-bumper out there, I don't think it's heavy traffic that makes Bill late. He takes the train, remember? 
  #Person2#: Oh, that's right. Well, the train shouldn't be late. That means there is only one explanation. . . . Bill must have overslept. 
  #Person1#: Well, to be fare, since he's coming all the way from Lancaster, he's got to get up much earlier than the rest of us. He must get start on his commute about six thirty, no telling what time he actually gets up. 
  #Person2#: That's right, because he's got to get to the train station from his house, then take the blue line into the city, then switch trains to the red line. In all, the trip's got to take more than 2 hours. 
  #Person1#: Why doesn't he just drive to work? 
  #Person2#: It's too difficult to park your car in the city. Also, the traffic coming in from the suburbs is a nightmare.