You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I support you today?

USER:  I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, May I know your name to change your reservation?

USER: My name is Larry Lewis.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation on your name to change your reservation.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Thank you for consulting us.