Do not turn an interview into a failure by saying that you have never made a mistake or you have not experienced failure. Nobody is perfect. The most successful people in the world have had many, many failures. Here is how an interviewer interprets someone with no failures:

☛ You do not take risks

☛ You do not set goals, so you never fail

☛ You are hiding something

☛ You do not take responsibility for your actions

☛ If something bad happens, you will blame it on everything or everyone else but yourself