You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need to cancel my reservation because of some problem in my family. Can you help me out?

ASSISTANT: Sure, I will help you in cancelling. Let me know your name to check your previous reservation.

USER: Myself Dorothy Brown.

ASSISTANT: Ok, give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Brown, there is no reservation found on your name to cancel your reservation.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Welcome. Thank you for choosing us.