You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent  reservation due to sudden cancellation my trip. Can you help me?

ASSISTANT: May I know your name please?

USER: Patrick Carter.

ASSISTANT: Sorry, there is no reservation found with your name Patrick Carter.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for choosing us.