Hello.
user
Hello. How may I help you now?
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.
assistant
Thank you.
user
To do modifications, let me know your name please.
assistant
Sure, myself Christopher Williams.
user
Thanks for your name, please wait a while.
assistant
Sure.
user
Thank you for waiting, there is no reservation found on your name.
assistant
It's ok, thank you for your time.
user
Thank you.
assistant