Hi.
Hello, how may I be at your service today?
 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 please?
Frank Lee here.
 Sorry, there is no reservation matching with your name in our portal to make changes further.
That's ok, thank you for your help.
Thank you for choosing us.