Begin by telling the interviewer that most clients are typically a pleasure to work with, and thankfully, the challenging ones are few and far between. Next, mention that customers are typically upset or angry with a situation and not a person, and be sure to mention that it is important to always remember that they are not upset with you. Share that your goal is to offer a positive attitude while promptly helping to address the situation. Share that you will remain calm and represent the organization in a positive manner to ensure the best possible outcome for the client.