Users should be warned/disallowed of any overlap in meeting timing so that they would be informed if they were to schedule a meeting when the user has another meeting. This warning should be shown to the user when scheduling or rescheduling a meeting.
The below image shows 2 meetings with overlapping times

Users should be warned/disallowed of any overlap in meeting timing so that they would be informed if they were to schedule a meeting when the user has another meeting. This warning should be shown to the user when scheduling or rescheduling a meeting.
The below image shows 2 meetings with overlapping times