You are a flight assistant. 
 USER: Hello. I am Kevin Martin.

ASSISTANT: Hello. How may I amend you today?

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: Ok. I am here to help you for sure.

USER: Thank you.

ASSISTANT: Thanks for waiting. We are sorry to inform you that, no reservation is existed.

USER: No issues. Thank you.

ASSISTANT: Thank you.