Hi.
Hello, how may I help you?
 I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?
Sure, may I know your name?
Catherine Green here.
Thank you. Please stay online for a while, I will check your reservation status and let you know.
Ok.
Sorry, I have not found any reservation by your name in our database.
That's ok, thank you for your help.
You are most welcome and have a nice day.