听下面一段对话, 回答第1至3题. 1. What does the man think of the mistake? A. It's just an ordinary mistake and doesn't matter. B. It could make him lose an important business partner. C. It could make him lose a good job. 2. What does the woman advise the man to do? A. Call his guests and explain the problem. B. Ask his guests to come in another day. C. Ask his guests to wait for him in the hall. 3. What can we know about the person who made mistake? A. He often forgets what the guests say. B. He has been fired because of the mistake. C. He is a green hand in the restaurant.