Treat the customer you’ll never see again like a regular. That’s who you actually are.

How you behave when there are no consequences is not a performance, it is your default setting. Someone who walks out and never returns is the cleanest test available, because nothing about being decent to them pays you back. Whatever you do there is what you are actually like, and it carries into everything else without you choosing it each time.

On your next shift, take the least important interaction of the day and give it your full attention. Not for a tip or a review. Just so the default stays where you want it.