Cancels an existing appointment for the user.
Context ID - ID of the referenced IAppointmentsContextAppointment ID - ID of the existing appointmentEmail - User identification.Result Variable Name - Default status, name of the variable that contains additional information (existing previous appointment version as you would get it with load appointment element, timezone)Timezone Mode - DEFAULT will use default timezone from referenced appointments context, CLIENT will try to get client information or SET will allow you to explicitly set the value.Timezone - only when timezone_mode is SET. PHP timezone name.ok - executes when the appointment was cancelednot_found - executes when the appointment could not be found