I have landed an airline company as a client and are implementing a Voiceflow AI agent that will handle customer support, as well as flight booking, which involves getting the users origin and destination, then getting their Departure Date, and Return Date (If it's a two way trip). I need to implement a calendar functionality in the chatbot such that the user can pick their depature date and return date. If a specific date doesn't have available flights within the database, the date is disabled on the calendar. I'm confused cause I was thinking the way I can do this is through inserting a calendly iframe, but how will the chatbot communicate with the iframe to get the date. I need help with the process I can follow to build such a functionality into the Voiceflow chatbot. Any help would be greatly appreciated.