You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Justin Campbell. I want to cancel my reservation, can you help in cancelling?

ASSISTANT: Sure, please wait for a while. Sorry, there is no reservation found on your name in our data base to cancel.

USER: That's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.