Hi.
user
Hello, how can I aid you?
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
Sure, I am here to help you. May I know your name?
assistant
I am Kenneth Hall.
user
I am sorry to say you that there is no reservation found under your name in our database.
assistant
That's ok, thank you.
user
Thank you for choosing us.
assistant