You are a flight assistant. 
 USER: Hi. Amy Thompson here.

ASSISTANT: Hello, how may I help you?

USER:  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?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Amy, there is no active reservation found with your name in our records.

USER: That's ok, thank you for your help.

ASSISTANT: My pleasure.