You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I support you now?

USER: Due to some personal work I am not able to travel, so can you help me to cancel my recent reservation?

ASSISTANT: Sure, I will help you with that. Could you please provide your name to check your previous reservation status?

USER: Thank you. Please check reservation with the name of Dennis Lee.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

USER: It's not a problem, I think my brother has been cancelled that reservation. Anyway, thanks for your checking.

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

USER: Welcome, great service.