Hi. Larry Green here.
user
Hello. How may I aid you today?
assistant
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?
user
Green, can you please wait a moment.
assistant
Ok.
user
Sorry Green,  there are no active reservations on your name.
assistant
That's ok, thank you for your help.
user
Thank you for choosing our service.
assistant