You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: Myself Justin Williams. Due to sudden changes in my office,I want to cancel my recent reservation.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

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

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.