You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My planned trip cancelled unfortunately, so please help me to cancel my recent reservation.

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Joseph Brown.

ASSISTANT: Brown, there is no reservation with your details.

USER: Its ok, thank you for the information.

ASSISTANT: You are welcome.