How does a company make sure its employees look like they enjoy being there to help others?

People in Hawaiian T-shirts. Delicious fresh fruits and vegetables. A place where parking is tight and aisles are tiny. A place where you will be unable to find half the things on your list but will go home satisfied. We are, of course, talking about Trader Joe’s , a unique grocery store headquartered in California and located in 22 states. By selling store-brand and gourmet foods at affordable prices, this chain created a special niche for itself. Yet the helpful employees who stock the shelves and answer questions are definitely key to what makes this store unique and helps it achieve twice the sales of traditional supermarkets.
Shopping here is fun, and chatting with employees is a routine part of this experience. Employees are upbeat and friendly to each other and to customers. If you look lost, there is the definite offer of help.

But somehow the friendliness does not seem scripted. Instead, if they see you shopping for big trays of cheese, they might casually inquire if you are having a party and then point to other selections. If they see you chasing your toddler, they are quick to tie a balloon to his wrist. When you ask them if they have any cumin, they get down on their knees to check the back of the aisle, with the attitude of helping a guest that is visiting their home. How does a company make sure its employees look like they enjoy being there to help others?