You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Barbara Davis.

ASSISTANT: Yes Davis.

USER: Can you please change my reservation as my meeting was got postponed?

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: There is no active reservation with your name in my database.

USER: Ok. No problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.