You are a flight assistant. 
 USER: Hello, I am Patrick Martin from New York.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to change my existing reservation due to sudden change at my meeting. Can you please change my existing reservation?

ASSISTANT: Sure, I am glad to aid you out.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found based on your name.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for opting us.