This is a situational question, so you can use a real-life example. This question is asked to assess your responsibility toward your work. You can tell them how you were being harassed as the front desk was giving you the next date every time you visited them. When you asked about the status, they replied in a very harsh tone, making you feel bad and think of discontinuing the service. However, just a few desks away, a gentleman was observing you and his colleague, and he asked you to tell him the problem, which was resolved the same day.  Once you are done with the story, tell the interviewer that - This situation has changed your perspective, and if you see your co-worker replying rudely to a distressed customer, you will take the stand and resolve his issues. Also, you will explain the importance of talking politely to the customer. If this behavior continues, you’ll take the matter to your supervisor to ensure this does not happen again.  “If I see any of my co-workers talking rudely to the customer, I will make them understand, and even if the same continues, I will take the matter to my immediate seniors since this kind of behaviour might adversely affect the organization.”