If your organization has scheduled an interview using the Google Calendar integration, you can cancel/delete the the interview directly from Greenhouse Recruiting.
To cancel a scheduled interview, navigate to the candidate profile.
From the candidate profile, click the Stage tab on the On Job panel and expand the stage that requires a cancelled interview.
Click Update next to the scheduled interview.
From the Scheduling page, click Delete Interview.
The interview is deleted, and the scorecard is removed from the interviewer's My Dashboard page in Greenhouse Recruiting. The interviewer(s) will be notified by email only if your organization has configured calendars to send email notifications for cancelled events.