The airline does everything possible to make SLF understand. When you check in, they tell you you have an allocated seat and here's the number .... as you board the attendant at the door tells you your seat is in row 12 on the left hand side ..... they constantly announce that you should go the seat shown on your boarding pass.
AND STILL THE WUCKFITS GET IT WRONG! I do wonder if they've travelled on cvonventional airlines before.