You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Michael Young. 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 for the trip. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, please wait while I fetch your current reservation details.

USER: Sure.

ASSISTANT: Sorry we don't have any reservation on your name.

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

ASSISTANT: Thank you.