The message 'The airline did not confirm the availability of seats at the selected fare' means that seats at this price have already run out.

It is possible that there are still seats available on your desired flight, but at a different price. Please refresh the search page to see the current fare for this flight or choose another suitable flight.

If the error recurs when selecting different flights from the same airline, it may be due to a delay in receiving data from that airline. You can try searching again within one or two hours or choose a flight from another carrier if there is a suitable alternative on your route.