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: May I know your good name?

USER: George Carter here.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: There is no reservation found on your given name.

USER: Thank you.

ASSISTANT: Thank you for opting us.