Why does Johnny look unhappy?

F: What’s up, Johnny? You don’t look very happy.
M: Nothing.
F: Come on, tell me. I’m your friend as well as your colleague.
M: It’s the customers. They always prefer Jenny to me. I can’t understand.
F: I can. It’s the way you communicate.
M: How can that be? I don’t even get a chance to speak to them.
F: Communicating is more important than speaking and listening, Johnny. Your body language is important, too.
M: What kind of language is that?
F: It’s the way you stand and sit and walk. It’s your gestures and expression on your face and in your eyes. Your whole appearance communicates things. Even when you’re not speaking.
M: Then what’s wrong with my body language?
F: The way you look at customers doesn’t give them a good impression, Johnny. You often rest your head on your hand. You look downwards. You don’t smile. You don’t turn your head or your body towards the customers. But look at Jenny. She’s holding her head up. She looks at a customer’s eyes. She smiles. She turns her head and her body towards the customer.
M: What is the difference?
F: Your body language is telling customers to go away. Jenny’s is making them feel welcome. That’s why they go to her, and not you. Now, what are you going to do?
M: I think I’d better follow your advice, and then see what will happen.