An alert icon will appear in FlightBridge informing you there are bookings and/or orders associated with a cancelled or changed trip.
Below is an example of the order detailing the changed that occurred. You can choose to edit the booking/order, cancel it or "Dismiss this Alert".
To review the pending alerts and any dismissed alerts, you can go to Requests > Alerts on the blue menu bar.
To view the Dismissed Alerts along with the Active Alerts, click Show Dismissed Alerts. Here you will be able to view the history of dismissed alerts. You may also use the search filed to filter down the list by trip ID, tail, location, etc.