You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Matthew Lewis.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.