Access session - Option to auto-close chat box on disconnect (not the close of session)

We use Control through Automate, and thus have thousands of access sessions open. When our engineers connect to a machine and chat with a user, then disconnect from the session, the chat box does not automatically close. This is a problem because the user still thinks they are chatting with the engineer. While an email is sent to us with the contents of the message, this box should be closed automatically on disconnect to prevent confusion for the end-user.

We would like an option to auto-close the chat box when leaving an open access session.