Since this type of job requires frequent interaction with clients, most companies prefer individuals with strong communication skills and also the ability to be persuasive.So when you go into an interview you should have that same kind of attitude along with a pleasant personality and good appearance, creating a first good impression. Since persuasiveness if part of the skill needed for this type of job, why not persuade them into why they should hire you ? Don’t be shy and show them your ability to interact and hold a conversation as the majority of the job requires regular contact with customers.