You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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, may I know your name for the changing reservation process?

USER: My name is Virginia Harris.

ASSISTANT: Sorry, no reservation found on your name in our data base to change.

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

ASSISTANT: Welcome, thank you for opting us.