How well do you think you performed in this interview today?

"Thank you for taking the time to meet with me today. I was well prepared for the questions you asked me, and I am happy with my performance in this interview. Can I ask if there is anything I can clarify for you or elaborate on from today's conversation?"

If you feel you could have performed better: 'I feel that I was well prepared for most of the questions you have asked me today; however, I would like to clarify my answer on one particular point....' Then, return to the question you may have stumbled on and answer how you would have liked to the first time.

If you feel the interview went well: 'Thank you for taking the time to meet with me today. I feel that I was well prepared for the questions you asked and am happy with my performance in this interview.' Then, ask the interviewers if there is anything you can clarify or elaborate on from today's conversation.