You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Jonathan Miller, I want to change my reservation as my plan to meet my parents is postponed due to urgent work. Can you help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Ok, thanks for the information.

ASSISTANT: Thank you for opting us.