title: Reprompt user if no response in google action?
body: <p>I am trying to make reprompts work for my action built using the dialogflow SDK.</p>
  
  <p>I have an intent 'answer-question' , however I would like a fallback intent to trigger if the user does not reply atall (after a certain unit of time if possible). </p>
  
  <p>I have tried to implement the instructions in this guide: <a href="https://developers.google.com/actions/assistant/reprompts" rel="nofollow noreferrer">reprompts google action</a>
  So I created a custom fallback intent to my answer-question intent, which has an event of <code>actions_intent_NO_INPUT</code> and a context of <code>answer-question-followup</code></p>
  
  <p>However when testing the intent , it will wait indefinitely for a user response, and never trigger this custom fallback intent.</p>