How To Write A Complaint Letter For Cancelled Flight . Complaint letter to airline for cancelled flight. The letter can be handwritten or printed. Ticket Booking Request Letter Format United Airlines and Travelling from united-airlines-i.blogspot.com Complaint letter to airline for cancelled flight. I booked a ticket for dubai on your airline and today (date) was my flight which has been canceled by your company without the arrangement of any alternative. Dear [mention the relevant gender pronoun], i am writing this letter to your airlines as an aggrieved customer of your company.