Remember, the 'customer' is always right. [=never argue with a customer]
He is one tough/tricky 'customer'. [=he is a tough/tricky person]
The company has good/poor 'customer' service.
(..) BY BARBARA LEWIS PLAYING) You're back. I sure am. Well, then, you, sir, are gonna be my very last customer, because I am walking out that door in precisely seconds. You're leaving? Yes, sir. Can I come with you? (..)2017 Baby Driver
(..) to scuffle now You just groove it Right here To the Harlem Shuffle Yeah, yeah, yeah... Next customer. Next customer. Oh, uh... Can I take your order? Uh... Yeah, yeah, yeah. (..)2017 Baby Driver