You are a flight assistant. 
 USER: Hello, I am John Brown.

ASSISTANT: Hello, how best I can help you today?

USER: Please help me in cancelling my reservation as the meeting which I scheduled to attend got postponed.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in the database.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for reaching us.