If a customer comes to you and he is very angry what do you do ?

Coach the person as how to tackle the issue that is making him/her be in that state. 

First listen to the problem faced by the customer. After that provide the possible remedy or resolution to him. This practice will gain the confidence and maintaining goodwill of the enterprise, you are working for. Put yourself into customer position to understand his concern.

I have worked with customers my whole career and I learned the customer is always correct.  The first thing you should do is to de-escalate the situation by listening to the customer concerns and find out what you can do to satisfy the customer.  Listening skills are important.

I will keep my calm, and try to normalize him with best hospitality servicies available around. Then I will try to communicate him that all his quesies will be adressed.

I will first listen to customer concern and later provide a possible solution

I will deal with him very calmly and absorb his anger and I will treat the subject well through persuasion

As a professional Customer care agent, You bshould allow him/her to vent his/her first. Then you apologise, then resolve the issue or provide solution for such customer after that.

You coach the customer on how to deal with such issues next time and if it is something that the customer cant resolve then you let it be after resolving.

welcoming him with smile and try to find solutions for his problems

I will try my best to understand his reasons of being angry and find out a way to bring the smile back to his face without giving concrete promise.

Before anything else you must have to greet whether she is good or bad mode and then just ask him or her what is there problem all about and of course apply it with a good manner to be solve because customer service is the most satisfactory of the customers needs..

First tell the customer to stay calm and ask what happen. Don't argue and listen to what he or she is saying and appologized for what happen. Then try to help find a solution to the problem that he or she encountered that cause his or her to be angry.