Use this script for some direction and make it your own: 

I’d level shift…”You know what? You’re right! There are only a certain number of things any agent can do to get a home sold and I think the final decision is not based on what I do differently… “I think the real issue is how you feel about the agent representing you…So tell me, what qualities are you looking for in an agent? Did you see how I shifted from “What do you do different”, to “What qualities are you looking for?” Top agent alternative: “My results”!