"When hiring sales associates, employers are looking for charismatic candidates who can provide helpful advice to customers and close sales. Be prepared to answer a few scenario questions that will assess your ability to handle difficult customers, sell a product, or excel on a team. Previous sales experience is an advantage, but not necessary."
Tell me about a time when you have been complemented for your customer service.
The best ones are ones where you make a bad situation good, displaying initiative etc
When you have done something extraordinary to help a customer for eg. helping a diabled customer