How can I lead a fruitful dialogue with the angry customer?

all answers are creative thanx for all 

Listening to the customer then i let him know that i understand the problem and his anger give him the solution or other options for his request , 

To be patient, listen to him till he finish, try to understand the problem facing him, and then try to solve this problem fast according to the company guidelines.

First, you need to choose your words carefully. Remember that the client is always right, even when he is wrong. Second, try to understand his problem and tell him you are going to do everything you can to help him. Make him feel like you are taking his case personally, it will make him trust you more when you'll talk to him. You can then treat him like you'd treat another client :)

I always let them vent out, listen to their frustration. once their done talking that's the time that I ask question that will give us solutions to their problem. Usually customers aren't mad at us, their mad about the situation they're in. we always need to put ourselves in our customers shoes whenever we encounter angry customers. 

If we have full faith in the principle that the customer is always and never the right , we can resolve any discussion with any angry customers have one thing in Huan basis of the development of any product or service is to express an opinion submitted Ailem service or product , but what happened in our evolution in the universe himself

Never Interrupt any customer who is angry raising his issue / concern as it agitates more rudeness. Let  the customer express out his / her agony completely. Now, Politely address the customers on Practical constrains involved Pro's and Con's surrounded. Take Initiation in resolving the query and ensure you build the confidence of resolving the issue in a positive approach more or else on a win - win Situation.