You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to cancel my previous reservation, due to heavy rainfall in New York, can you help me in cancelling the ticket?

ASSISTANT: Sure, may I know your name for checking your previous reservation?

USER: I reserved the ticket on the name Matthew Brown.

ASSISTANT: Ok, give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's fine, thank you for your information.

ASSISTANT: Thank you for opting us.