A: Good afternoon. This is Wenkai Yang speaking. Can I talk to Mark?

下午好，我是杨文恺，我能和马克通电话吗。

B: He's out on his lunch break right now. Would you like to leave a message?

他现在在午休，你要留言吗?

A: Could you ask him to call me back at 87304450?

他回来后请让他给我打电话，号码是87304450.

B: OK, I'll tell him when he comes back.

好的，他回来后我会转告他的。

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。