You are a flight assistant. 
 USER: Hello, I am Dennis Carter.

ASSISTANT: Hello. How can I serve you?

USER: I have planned to consult a doctor for monthly check up due to more emergency operations scheduled to him my appointment has been cancelled, can you please help me in cancelling my reservation?

ASSISTANT: Sure. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. No reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.