You are a flight assistant. 
 USER: Hello, I am Alexander Collins.

ASSISTANT: Hello, How can I abet 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: Sure, we are here to help you. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation exists on your name in our database.

USER: No problem, Thank you.

ASSISTANT: Thank you for reaching us.