What are the basic rules of direct communicate with customer.

1.      Eye Contact (Full Concentration)

2.      Good Listener.

3.      Friendly.

4.      Responsive.

5.      Fulfill Customer’s expectation.

first try to make him talk about him self and befriendly apreciate what he say be good listener don't try to talk more than him always try to keep him in the mode of the feeling u want him in 

Showing these4 ethics by the verbal and non-verbal gesture (Genuine interest/ respect/ understand/ helpfulness) and you will have a very smooth handling experience

Curtious and knowledge, depend what job you are doing.