retain information by passing through flows in Dialogflow CX

Hi, 
I built a chatbot in dialogflow CX with several flows. I want to keep a information (for exemple i'm already client) even if I'm moving from one flow (move) through different flows and back to the flow move... I don't want the bot ask the question again when I've already got the answer... 
With conditions/variables  i guess but I don't know where and what to put on. 

Thanks 

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