You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER:  I need to change my reservation due to my planned event got cancelled. So please help me with that.

ASSISTANT: May I know your name please?

USER: I am Laura Lee.

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a nice day.