You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name?

USER: I am Raymond Allen. I want to change my existing reservation as my trip got postponed.

ASSISTANT: Sure, please wait a minute.

USER: OK.

ASSISTANT: Thanks for waiting, no reservation is found with your name.

USER: That's fine. Thank you.

ASSISTANT: Thank you, for connecting with us.