Hello! I know this has been reported as a feature request before, but I did want to echo the request to add a blocking feature for specific emails. Our team manages training sessions and a lot of times we have users who will no show or cancel last minute sessions numerous time when other users are having to schedule weeks out. Since Calendly does not offer a waitlist option or a blocking option our calendars quickly get booked months in advanced to then be empty day of.  Thanks much!