title: actions_intent_CANCEL not working as expected
body: <p>I am trying to follow <a href="https://medium.com/google-developers/5-tips-from-building-an-action-with-a-conversation-designer-ac8ec6bfff6a?linkId=57344003" rel="nofollow noreferrer">this</a> great article on Medium written by <a href="https://medium.com/@jessicadeneearley" rel="nofollow noreferrer">Jessica Dene</a>. When users say a global cancel command such as "quit", I want my action to respond with a "goodbye" message. I have tried to follow the instructions provided by Jessica as illustrated below:</p>
  
  <p><strong>Add the actions_intent_CANCEL event to my end intent</strong></p>
  
  <p>Know More - no - no is my end intent. As you can see below, when I try to add "actions_intent_CANCEL" under Events, I can't see it as a suggestion in the drop down</p>
  
  <p><a href="https://i.stack.imgur.com/UVyk9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UVyk9.png" alt="enter image description here"></a></p>
  
  <p>But given that actions_intent_CANCEL does exist according to <a href="https://developers.google.com/actions/reference/rest/intents" rel="nofollow noreferrer">docs</a>, I added it</p>
  
  <p><a href="https://i.stack.imgur.com/iy5hu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iy5hu.png" alt="enter image description here"></a></p>
  
  <p><strong>Error</strong>
  I saved the intent and tried in the web simulator, I see the below error</p>
  
  <p><a href="https://i.stack.imgur.com/64Zoa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/64Zoa.png" alt="enter image description here"></a></p>
  
  <p>Any idea why I am getting this error?</p>