You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Please, help me in changing my earlier reservation as my plan to meet my friend got postponed.

ASSISTANT: Sure, may I know your good name?

USER: I am Charles Young.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.