It sounds like a trick question, but it's not.
Customer expectations are typically “just to be satisfied” with the process – buying a product or receiving a service. If you met these expectations, congratulations, you have a Customer.
However, if you meet their needs – which they may not even know – by providing a product or service that that really needed, you surpassed their expectations, and now, CONGRATULATIONS – YOU HAVE A RELATIONSHIP!
Take the customer who comes into ABC Widgets to purchase the same Super Deluxe Widget that their neighbor just bought for $300. As the best salesperson at ABC Widgets, you learn – through asking – that the customer in front you only needs the Deluxe Widget, because their thingamabob is much smaller than their neighbors, and the Super Deluxe Widget would be more than he needs. The cost of the Deluxe Widget is $200. You’ve cost ABC Widgets $100.
BUT…you now have exceeded your Customer’s expectations by simply meeting their needs and have built a lasting relationship, which will make back that $100 multiple times.