You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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, we are happy to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Myself Susan Clark.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.