You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Stephen Lee here. I would like to cancel my reservation due to some issues, can you please help me in cancelling?

ASSISTANT: Sure Stephen, I am here to help you with this.

USER: Thank you for accepting my request.

ASSISTANT: Sorry Stephen, there is no reservation found under your name to cancel it.

USER: That's ok, no problem.

ASSISTANT: You are welcome, have a great day.

USER: Thank you for the information.