As an Admin you can cancel every meeting (Pending or Accepted).
This is how you do it:
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In the backend go to Meeting Management -> List Meetings.
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Select the correct Session/Day at the top and find the meeting you want to cancel.
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Click cancel under the meeting.
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In the popup window click OK.
To find the meeting you are looking for, you can use the day and timeslot filters above the list or type a person or company name in the search box in the top right corner.