You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: May I know your name to check your previous reservation?

USER: Sure, my name is Carolyn Thompson.

ASSISTANT: Please wait a moment to check.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us, have a great day.