title: How to make a while loop by dialogflow intents?
body: <p>I have the following intent and followup intents for a user login process:</p>
  
  <p><a href="https://i.stack.imgur.com/diFUQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/diFUQ.png" alt="Pic1"></a></p>
  
  <p><a href="https://i.stack.imgur.com/FNOEM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FNOEM.png" alt="Pic0"></a></p>
  
  <p><a href="https://i.stack.imgur.com/ktluS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ktluS.png" alt="Pic2"></a></p>
  
  <p><a href="https://i.stack.imgur.com/PsmcX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PsmcX.png" alt="Pic3"></a></p>
  
  <p><a href="https://i.stack.imgur.com/VMWuf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VMWuf.png" alt="Pic4"></a></p>
  
  <p>How can I set a while loop for this login process in order to continue asking user email while user enters email address incorrectly and after he/she enters it correctly the getting password intent triggers?
  In my cases after 2 incorrect entry, api.ai will response "Not Available".</p>