You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: Due to some emergency situation, I need to cancel my recent reservation.

ASSISTANT: OK, may I know your name?

USER: My name is Patrick Parker.

ASSISTANT: Sorry, to inform no reservation found with your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for choosing us, have a good day.