You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, how can I support 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 in changing my reservation?

ASSISTANT: Sure, may I know your name to check further?

USER: Sure, myself Gregory Garcia.

ASSISTANT: Sorry, no active reservation found with your name in our records to change it.

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

ASSISTANT: Thank you for contacting us.