Before I ask questions of a consumer or a client, I ask questions of myself first. Who do I want to be? What parts of my personality do I want to bring to this situation? In my case, I always want to be warm, friendly, funny, inviting, encouraging, and empathetic.
Every dialogue has two sides. Every interview is a transaction, an exchange. What will my half of the transaction be? What am I bringing to the table? What is the energy that I will evoke? Because energy transforms you-you aren't just acting, you're being.
So that's the first element of asking questions: Pay attention to how you are, what your presence is, what your energy is like. Think about how you are being in addition to thinking about what you're doing.