Speaker A: Mr. Carson, Dr. Brown will have to change your appointment to tomorrow at the same time. He’s still waiting for a flight out of New York.
Speaker B: （）。
A. Oh, well, thank you for calling. I’ll see him in his office then.
B. I’m sorry to hear that his flight is delayed.
C. But are you sure he will be in his office at that time
D. Yes. That’s quite understandable.
