David is out for lunch.
be/go out for...
Susan is out for shopping.
Let's go out for a drink.
A:Hello. Can I talk to David?
B:One second, please. ( a few seconds later, the receiver comes back and says) Hello?
B:I'm sorry. David is out for lunch right now.
A:Okay. I'm his wife. Could you tell him to call me back when he returns?
A:Thanks. Please tell him to call my cell-phone number.
B:Ok, I will.
A:Thank you very much.