When you receive excellent Customer Service, do you take the time to find a Manager and share that Associate's performance with them?
You certainly would if the interaction had gone badly, no?
Taking the time to make sure a Manager knows one of his Team Members is doing well could pay off for you on future visits. The Manager would not only be able to commend the Associate on a job well done, but can also use it as a training tool to reinforce "best practices" with the rest of the Team.
"...is the most important visitor on our premises. He is not dependent on us; We are dependent on him. He is not an interruption in our work. He is the purpose of it. He is not an outsider in our business. He is part of it. We are not doing him a favor by serving him. He is doing us a favor by giving us an opportunity to do so."