You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Actually my Musical concert date is extended, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your good name?

USER: Yes, I am Patricia Turner.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.