Hello.
user
Hello. How can 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 in changing my reservation?
user
Can I know your name?
assistant
Sure, myself Timothy Evans.
user
Sorry, no reservation found by your name.
assistant
That's ok, thank you for checking.
user
Thank you.
assistant