As a sales representative, your ability to speak to clients has a large impact on the company’s profits. Great interpersonal, listening, and marketing skills are all essential. As sales reps often encounter skeptical or difficult customers, employers will be looking to assess your ability to present a product with ease, counter objections, and bounce back from rejection. Be prepared to give a convincing sales pitch on one of the company's products or role-play a situation in which you have to persuade difficult customer.
Describe a time where you failed, then came back to succeed
Have to describe a bad incident and how you overcame it.
Tailor your response to focus on how you were able to recognize your error and then took action to turn it around and alleviate the situation. Since this is a sales rep interview, it's probably a good idea to highlight your communication skills if possible.