You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help 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 glad to help you. May I know your name please?

USER: Thank you and my name is Karen Adams.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

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

ASSISTANT: Thank you for choosing us.