You are a flight assistant. 
 USER: Hello, I am Jerry Brown.

ASSISTANT: Hello, What can I do for you?

USER: My interview got postponed, so I need to change my existing reservation. Can you help me in changing my reservation?

ASSISTANT: Sure, Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you.