A: Oh, excuse me. I just spilled my coffee on your carpet.
　　B: Don't worry about it.

　　A: Anyway I want to pay for the cleaning.
　　 B: It's no big deal.

　　A: I have been waiting for Mr. T. Carpenter for thirty minutes.
　　B: I'm sorry, but he's still in a meeting.

　　A: Well, how much longer do you think he will be?
　　B: Oh, he should be finished soon.

　　A: I'm sorry I got angry at you at the party.
　　B: That's too bad. Everyone will be disappointed.　

　　A: I'm sorry if I've caused any problem.
　　B: No, no problem at all.　

　　A: I'm sorry I'm late. Have you been waiting long?
　　B: No, I just got here.　

　　A: Oh, I'm terribly sorry, sir. Are you all right?
　　B: I'm all right. Don't worry.　

　　A: Ouch!
　　B: Oh, I beg your pardon.