How to get a variable from a DialogFlow

Summary

Trying to set the value of a variable from the bot flow and use this value later in the custom component

Content

Hi,

I am asking how can I use a variable in custom component which I defined it in the DialogFlow

any idea please? 

thank you 

Code Snippet

///////////////////////////// Flow ////////////////////////

context:
  variables:
....
    Code : "int" 
states:
start:
    component: "fn.sample.BotComponent"
    properties:
      Code: "Code"
    transitions:
      next: "Intent"
....
SetCode:
     component: "System.SetVariable"
     properties:
       variable: "Code"
       value: 0
     transitions: {}
  commonPart:
    component: "System.Output"
    properties:
      text: "please upload an image for the common part of your accident