You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I need to cancel my reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation?

USER: Sure, myself Marry King.

ASSISTANT: Sorry, no reservation found in our data base to cancel your reservation.

USER: No problem, thank you for searching.

ASSISTANT: Welcome, have a nice day. Thank you for opting us.