A: Hi, I am sorry to be late. B: What happened? You were supposed to be here an hour ago. A: Yes, I know. But I missed my flight. B: You missed your flight. How did that happen? A: I got on the wrong bus this morning, so I was late to theairport. By the time I arrived, the gate was closed. B: What did you do then?A: I had to re-book my flight and get on a waiting list. B: Oh, that's too bad. At least you got it. A: Yes, it wasn't easy getting on the next flight. I had to run to the gate.