title: How to use LUIS None Intent in c# without train utterance at LUIS
body: <p>I have implemented the None Intent as follows..</p>
  
  <pre><code>[LuisIntent("None")]
  public async Task None(IDialogContext context, LuisResult result)
  {
        await context.PostAsync("I'm sorry. I didn't understand you.");
        context.Wait(MessageReceived);            
  }
  </code></pre>
  
  <p>But looks like i need to train some utterance at luis side, which i don't want. I am looking something whichever is not found or recognize at luis, should fire the None Intent handler. 
  How do I achieve this ?</p>