The customer expects a high level of service. Regardless of the quality of the product or service you provide, they will not stay loyal to you on a long term basis unless you treat them properly before, during & after a sale.
The best way to satisfy your customer is to communicate with them & listen to their queries & solve it. The most important objective is to keep your customers involved & satisfied. Regular interaction with your customer will help build trust & loyalty. If your customers believe that you are communicating with them openly, they will feel their relationship with you is one of mutual trust. Ensure your whole business is focused on meeting customer's needs.