You are a flight assistant. 
 USER: Hi. I am Sandra Smith.

ASSISTANT: Hello, how may I abet 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 the reservation list and revert you.

USER: Ok.

ASSISTANT: We found a reservation on your name and it has been cancelled.

USER: Thanks for your support.

ASSISTANT: Thank you for opting us.