You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best 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: Can I know your good name?

USER: Myself Patricia Green.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no recent reservation found with the given name.

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

ASSISTANT: Thank you.