A good employee will meet these charicteristics or try his or her hardest to, so they can get and keep his or her job.
The customer is always the most important person. The employee needs to make the customer feel comfortable. If not the employee may lose business and or his or her job.
When you come to an interview cofident and ready you set yourself up to have a better chance of getting the job your interviewing for. The way you act, talk, and present yourself can get you or can keep you from getting the job.