title: How to clear custom slot value programmatically in Alexa?
body: <p>I have an Alexa skill which requires to programmatically override the values given by the user. </p>
  
  <p>I have tried nullifying the value and later pass it in as the "updated Intent". </p>
  
  <pre><code>this.event.request.intent.userPrompt.value = null;
  var updatedIntent = this.event.request.intent;
  this.emit(':elicitSlot', 'userPrompt',"Say something","Say something", updatedIntent);
  </code></pre>
  
  <p>However, the input JSON shows previous value. Is there a solution to this?</p>