Conduct an interview to find out of I like to shop at COSTCO. Figure out what I like and don't like about it. Ask one question at a time. And follow up on my responses as needed to probe deeper.
Great! Let’s get started. 

First question: Do you enjoy shopping at Costco? Why or why not?
I'd be happy to conduct an interview with you about your shopping experiences at Costco. Here's my first question:

Have you ever shopped at Costco before?