At the end of the audition, most auditors will simply say thank you. Return the thanks and leave. Do not linger, do not ask questions, do not compliment their previous work, do not tell them you have a friend in common, etc. Stay open and polite. If you are asked some follow-up questions, have a friendly, pleasant conversation. Be alert for cues that the conversation is over. A little respect for the auditors' time goes a long way.