You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Kenneth Jackson. I would like change my existing reservation, due to my golf event has been postponed.Can you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry we have not found any flight reservation on your given name.

USER: Thank you for your kind help.

ASSISTANT: Thanks for choosing us.