title: Dialogflow CX $param not showing in agent text
body: <p>I am getting into CX and have a simple agent going but I cannot get the agent to respond with my filled parameter.</p>
  <p>I have a page that asks for @DrinkFrequency and @DrinkChoice, I see both get filled correctly when I test the agent and <code>$page.params.status = FINAL</code> takes me to my next page that says</p>
  <pre><code>So you drink $session.params.DrinkFrequency and prefer to drink $session.params.DrinkChoice 
  </code></pre>
  <p>But the agent says exactly that, it does not replace <code>$session.params.DrinkFrequency</code> or <code>$session.params.DrinkChoice</code> with the values the user gave. I know it must be a simple issue but I have tried to write <code>$session.params.DrinkFrequency</code> in a few different ways and I looked at the existing tutorial bots and they also have it with just the <code>$</code> sign. Am I not saving the user given value?</p>
  <p>The page that gets the values has the two parameters and they ask for the value in their &quot;Initial prompt fulfillment&quot; field.</p>
  <p><img src="https://i.stack.imgur.com/dWU6i.png" alt="Screen of the page asking for the values with one selected" /></p>