How do you answer 'When were you most satisfied in your job' in a job interview?

In order to make a customer satisfied you need to address their needs. Too often do salespeople address every product/option available. Ask the customer probing questions to find out about their needs. Based on their needs, fit them into the best product for such. Be honest in regards to benefits/drawbacks in these particular options. Offer follow up if necessary. (If a large ticket, low volume product - follow up is a necessity)