I'm told that when the interviewer asks about conflict the interviewee should never say they have conflict with their boss.

In fact, those are the conflicts that I want to hear about.

If the conflict is that he wanted to do it one way and the employer another way. I want to know all the details so I can determine who I think was right and whether the resolution was reasonable. If both people were looking after the best interest of the company instead of their egos, maybe it was a good conflict.

I'm also aware that, on average, an employee needs to lose about half the disagreements. If he always wins it might be a sign of either a dumb boss or an impossible employee. Or, if he always loses he must be doing something else wrong.