You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: As my meeting got postponed with my client, can you please help me in cancelling my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your name to check with existing reservation?

USER: I am Ronald King.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.