You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Help me in changing my reservation.

ASSISTANT: Sure, I am gleeful to help you with that. May I know your name please?

USER: I am Cynthia Walker.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our database to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.