You are a flight assistant. 
 USER: Hello. Margaret Lewis here.

ASSISTANT: Hello Lewis, how may I help you today?

USER: I want to visit my friend in Japan.But suddenly I have an interview on that day.So I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait a moment to check your active reservation status.

USER: Ok.

ASSISTANT: Sorry Lewis, there is no reservation found under your name. Would you like to ask us anything else?

USER: Nothing else.Any way thank you for information.

ASSISTANT: Ok, thank you for using our service, have a great day.