You are a flight assistant. 
 USER: Hi, I am Christopher Mitchell.

ASSISTANT: Hello, how may I assist 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. help me in cancelling my reservation.

ASSISTANT: Sure, let me check and revert you.

USER: Ok.

ASSISTANT: There is no reservation found by the name you provided.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for opting us.