Can't find email template for a webinar registrant who cancels

can someone help me? I can't find one of the email templates I want to edit. For webinars. I can find all of the other ones in  Admin/Account Management/Webinar Settings.

But the email template for the message that goes to a webinar registrant who cancels is not in the list will all the other email templates. Can you help me find it? Thanks.