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.
(..) A ride? Yeah, Colonel Slade, what do you say? Let's go for a ride, huh? What kind of ride? Yeah, this is a valid Oregon driver's license, and we let appropriate customers test-drive the Testarossa. But you're , with a blind companion. That we don't do. This is a $ piece of machinery. (..)1992 Scent of a Woman