10 ways to serve customer well

What is the relationship between marketing and customer? It is a simple question, we can simply say that the good marketing will interests our customer to purchase our product or service. A good service to the customers will make those customers come and purchase our products on the next time.
It is more time, money and energy to have a good marketing but to give an excellent service to the customers, we don't have to spend a lot our time and money.
Then, below I attach 10 ways to serve our customer well:
1. Smile, smile and smile.
Give a warm smile to your customer at the first time he visit you. Many customer services do not obey this attitude because of many factors. A smile at the first sight customer visit you will reflect your personality and professionalism whether you give your best service or not to him.
2. Imagine that you were him
When the customer comes to you and brings a problem to solve, imagine that you were him. If you were him,you will be glad that your problem is solved by the customer service well. He will remember you as a solving problem agent. He will say thank to you for solving his problem.
3. Give your empathy
A customer may come to you with a complicated problem that has not been done by prior customer service. He may angry with you due to bad service he receive before. Then, you must give your fully enthusiasm, beg pardon for being inconvenience and the most important thing is that you must give your empathy to him because he still has his problem. Reduce his anger by delivering your apologize. By showing your empathy, he will understand that you are really care to him and his problem.
4. Make a repetition of his question
It means that you have to make sure that you really understand about his problem by repeating his question, for example: " well sir, so you ask for 1) bla bla... and 2nd) bla bla...,", By doing that action, a customer will not doubt that you are the right person who can solve his problem.
5. Ask for permission
Whenever you need time to make escalation to solve customer problem, ask him a permission before leaving him alone in front of your desk. It can be conducted by saying, "I will ask to another department sir, so would you mind waiting for the second sir?"
6. Give attention to the children, also.
When the customer come with his children, take a little time to greet them. Ask their name, give a small talk to them. Just give attention as well as their parents.
7. Give the complete answer.
Give your customer full information needed. We can not simply say "yes" or "no" to him. Give a good reason why you prefer say yes for one circumstance. It would be better if you give more description to the customer so that he can make a comparation between one and another product.
8. Do the recheck
Before customer leave you, make a recheck to the product he has purchased. It will be good if you do it in front of the customer. 
9. Give extra service
When you finish to handle all of the customer needs, don't forget to give him extra service, for example by asking him, "Is there any another thing sir that I can do for you?" If the answer "yes" ask the next problem and solve it perfectly.
 10. Give smiling parting.
When the customer feels satisfied with your excellent service, send him a warm smile before he leave you. That closing smile will reflect to his mind that you are a nice and friendly agent of customer service.