You do not need any dialog to guide you. But if I can suggest, you fast and pray for the Spirit to aid you.
When I am asked to give the invocation, I do seek guidance of the Spirit for GOD's will for the membership and speakers. I would ask GOD, that my voice would be HIS voice in this prayer or talk. When it is done with humility and it is sincere, in your prayer, you will find the Holy Ghost will touch you and give you that feeling of assurance.
Have faith in your great ability to do the right. God bless...
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