You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

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, may I know your name to check for the previous reservation?

USER: Sure, myself Patrick White.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name in our data base.

USER: It's ok, thank you.

ASSISTANT: Thank you for contacting us.