You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in modification of my reservation as my meeting got postponed?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Thank you for your concern, my name is Nicole Johnson.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Oh! So sad to hear, it might not booked properly at the time of booking. Anyways thank you for the information.

ASSISTANT: Thanks for contacting us.