You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation as I am sick and cannot go on the trip right now. Can you please help?

ASSISTANT: Sure, may I know your good name?

USER: Mt name is Kenneth Johnson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found on your name.

USER: No problem, thank you for checking it.

ASSISTANT: Thank you.