/If you don’t understand any word or sentence, you can copy to translate/
Hello. Can I talk to David?
One second, please. ( a few seconds later, the receiver comes back and says) Hello?
I’m sorry. David is out to lunch right now
Okay. I’m his brother. Could you tell him to call me back when he returns?
Sure. Does he know where to call you?
Oh, thanks. Please tell him to call my cell-phone number.
Ok, I will.
Thank you very much.