This is a simple conversation that happens at 99% of the encounters:
ME: Hello my name is ______ and I am from the Rock Church. I am here today to invite you to church and to ask if there is anything, that we at the Rock, could pray for you about?
THEM: Thank you!! Yes I have heard of the Rock. Please pray for my brother who just lost his job last week.
ME: Yes of course, do you mind if we pray for him right now? May we give you a gospel tract?
THEM: Yes, please.