"Companies depend on sales consultants to establish trust between clients and companies through their marketing, interpersonal, and customer service skills. Expect to draw heavily on previous experience during an interview. Popular questions ask about situations in which you have changed a client's mind or demonstrated strong interpersonal skills during challenging times. You may also have to demonstrate your sales skills by pitching a product to the interviewer."
What makes good customer service.
Good customer service is listening to the customer when you ask them a question. Allow them to explain what they want the product for, if there is a specific requirements or boundries they have for that specific product.