Hi.
Hello, how can 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, I am here to help you. May I know your name to check with existing reservation?
Linda Perez here.
I am sorry to say you that there is no reservation found under your name in our database.
That's ok, thank you for your help.
Thank you for choosing us.