You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid 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, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Myself Mary Hall.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.