Hi.
Hello, how can I assist 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?
I am Kenneth Nelson.
Please wait a second.
Ok.
Sorry, no reservation found on your name.
That's ok, thank you.
Thank you for availing us.