You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Matthew Young.

ASSISTANT: How can I assist you today?

USER: I need to cancel my recent reservation due to postpone of my seminar. Could you please help me in doing that?

ASSISTANT: Ok, I'll help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Young, there is no reservation found under your name to do cancellation.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.