Letter about airplane

Dear Sir…
I am writing to express my strong dissatisfaction with the quality of your airline service. On August 9, 2021, I flew to Seoul with my family and a friend. An unfortunate incident happened during check-in. During the baggage check the man gave me a disapproving look. He called security and they began to examine us. When they finished checking, they did not find anything and the man, being rude to us, let us through. Due to this long delay, we missed our flight and had to wait for the next one. …