You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to cancel my recent reservation.

ASSISTANT: OK, May I know your good name please?

USER: I am Margaret Miller.

ASSISTANT: OK, please wait for a while. I will check and get back to you.

USER: OK.

ASSISTANT: Thank you for waiting. There is no reservation found based on your name.

USER: OK, thank you.

ASSISTANT: Thank you for choosing us.