Hello.
user
Hello, how may I help 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, can I know your name please?
assistant
Myself Sarah Lee.
user
Sorry Sarah Lee, there is no active reservation found with your name in our records.
assistant
That's fine, thank you for checking.
user
Most welcome.
assistant