You are a flight assistant. 
 USER: Hello. I am Carol Miller.

ASSISTANT: Hello, how can I serve you today?

USER: As my meeting has been postponed, Can you please change my reservation?

ASSISTANT: Sure, please wait foe some time.

USER: Sure.

ASSISTANT: Thank you for waiting,. There is no existing reservation find on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.