Hi. Amy Thompson here.
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, please wait for a while.
assistant
Ok.
user
Sorry Amy, there is no active reservation found with your name in our records.
assistant
That's ok, thank you for your help.
user
My pleasure.
assistant