Hi.
Hello, how may I aid 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, I am here to help you. May I know your name?
Ronald Smith here.
Please give me a moment to check your ticket status.
Ok.
Sorry Ronald Smith, no reservation is available by your name.
That's ok, thank you for your help.
Thank you for choosing us.