Be honest with your client. Be responsive and open to all of his criticisms and try work on them with the perspective of converting your drawbacks into your strengths. Try treating your customers in the best way out as they are the source of revenue for your business keep your promises. Be knowledgeable. Know the facts about your products or services. Understand company policies. In addition, know as much about your client’s business and needs as you can. and anticipate your client’s needs.