title: How can i authenticate the user's input?
body: <p>Building a chatbot using node.js that will be communicating with Luis.</p>
  
  <pre><code> if (!meeting.datetimeV2) {
              builder.Prompts.text(session, 'what is the date and time');
          } else {
              next();
          }
  </code></pre>
  
  <p>This section is supposed to take date and time code for example:</p>
  
  <pre><code>Bot: what is the date and time?
  human:today at 5pm
  </code></pre>
  
  <p>The issue i'm having is that the bot is accepting inputs like <code>jagahgdh</code> or <code>ffffff</code> basically troll answers which is expected due to the use of <code>builder.Prompts.text</code> but my question is how can i fix that and make sure the users input has the proper format or i'll have to ask the same question again.</p>