Why does China Southern send text messages like this?

Flight cancellation means that the flight that was scheduled to perform the flight mission stopped flying, and at least one seat of the flight was reserved.

If the flight is cancelled, the airline will contact the ticket office where the ticket was issued, and let the ticket office inform the passengers whether they need to change other flights on the same day or the next day. The specific flight changes depend on the local weather and flight attendance.

If the passengers are informed in advance of the cancellation of the scheduled flight, the airline will cancel and refund the ticket for the passengers free of charge, but the passengers need to contact the counter as soon as possible to try their best to meet the passengers' change requirements on the premise of having seats.

If the flight is delayed or cancelled due to maintenance, flight deployment, business, crew and other reasons, the airline will provide passengers with flight dynamic information and arrange services such as meals or accommodation.

If the flight is delayed or cancelled due to weather, emergencies, air traffic control, security check and non-carrier reasons such as passengers, the airport can provide passengers with flight dynamic information and help them arrange meals and accommodation at their own expense.