You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve 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: Myself Paul Perez.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

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

ASSISTANT: Thank you for contacting us.