You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  Unfortunately I have emergency meeting so I want to cancel my reservation, can you please help me in cancelling my reservation?

ASSISTANT: Ok, please help me with your name so that I can help you easily.

USER: I am Brian Perez.

ASSISTANT:  We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for contacting us.