This happened to me last summer when Etihad canceled my flight from Abu Dhabi to London due to an aircraft issue. I got an email with options to rebook, but I was traveling with kids and didn’t want to risk messing anything up online. I called their support at 877-764-3622, and the agent immediately pulled up my reservation. They offered me a choice between a full refund or being rebooked on the next available flight. I went with rebooking, and they confirmed the new flight and seat assignments while I was still on the phone. The confirmation email came through within minutes, which really eased my stress. I’ve also used that same number once to add baggage, and both times it was quick and straightforward. If your flight gets canceled, calling is honestly the fastest way to get sorted out.