-Hello! Could I speak to John Martins, please?
-I'll tell her. Can I ask who is calling, please?
-Thank you, have a nice day. Bye!
-Yes, she's here... but she's busy at the moment. Can you hold the line?
-Well, I'm afraid John is not available at the moment. Can I take a message?
-I'm sorry but I don't have enough time...
-Yes. I'm David Backwin.
-Oh... well... I don't know... Is Sandra in?
-Yes, could you please tell her that I've just phoned. I will call her back in a few hours.
-Thank you, Mr Backwin. I'll give her your message.
-Hello! Welcome to ToLearnEnglish.com! Sarah Andrews speaking.
-Would you like to leave a message?
Where do they work? (3 points)