A: Hello. May I speak to Mr. Brown? 您好，布朗先生在吗？ B: I'm sorry, he is not in now. Would you like to leave a message? 对不起，他现在不在。您想留言吗？ A: Will you ask him to call me back later? 你能告诉他待会儿给我打电话吗？ B: I'll let him know. 我会转告他的。