David is out for lunch.

David出去吃午饭了。

be/go out for...

出去做...

Susan is out for shopping.

苏珊出门购物了。

Let's go out for a drink.

我们出去喝一杯吧。

A:Hello. Can I talk to David?

你好。能让David接电话吗？

B:One second, please. ( a few seconds later, the receiver comes back and says) Hello?

请稍等。（片刻后，接电话者返回并说）喂？

A:Yes.

请讲。

B:I'm sorry. David is out for lunch right now.

很抱歉，David出去吃午饭了。

A:Okay. I'm his wife. Could you tell him to call me back when he returns?

好的。我是他妻子。等他回来了能让他给我回个电话吗？

B:Sure.

当然。

A:Thanks. Please tell him to call my cell-phone number.

谢谢。请让他打给我的手机。

B:Ok, I will.

好的，我会的。

A:Thank you very much.

非常感谢。

B:No problem.

被客气。