You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can assist you at this moment?

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 in changing my reservation?

ASSISTANT: Sure, I am here to help you to change your recent reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Karen Thomas.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there was no active reservation found on your name to change it.

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

ASSISTANT: Thank you for opting our chat service.