I've come to believe that's the wrong focus. Instead of thinking of what we're going to say, we need to focus on listening. What will we hear? How will we get the other person to open up? Can we learn enough about them to help them draw closer to God
The Christian life is meant to be lived out among non-believers, living in such a way that they can see who we are and eventually glorify God. A Christian life lived inside a building will never accomplish that.