I hope this letter finds you well. I am writing regarding a flight I missed due to the negligence of your airline’s staff that I felt needed to be reported.
Allow me to introduce myself, my name is William and I am one of your airline's customers. I am writing this letter to express my dissatisfaction with your travel services.
I regret to inform you that I missed a flight scheduled for 5th March 2023 at 5 pm, from London to Sydney. I firmly believe this is due to the misinformation conveyed by your staff.