You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide your at this moment?

USER: My interview got postponed, Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you with that reservation change. May I know your name please?

USER: Sure, I am Margaret Lewis.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting. There is no active reservation found with your name in our reservation list to change it.

USER: Ok, Thank you for providing information.

ASSISTANT: Most welcome, thank you for reaching us.