As an opportunity to develop our writing skills. The first is to plan the story, regardless of real people, and to build around the point of the story. Weave the people in where they are needed and will contribute. Not every story needs to have real people, said King. In some cases, you want to get in, explain, and get out quickly.
Real people can come and go, or they can come and stay.
There is not a formula. In fact, a formula will bring a new cliche. Quotes, the device by which we get people into print, drew special attention. Take them past their first, glib, practiced, predictable answers. We, as a profession, are tending to lose sight of the reasons that we use quotes.