You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Brian White here, I want to cancel my recent reservation due to my appointment with my doctor got postponed. Could you please help me in cancelling?

ASSISTANT: Sure, we are here to help you. Please wait a moment I will check the reservation on your name and revert you.

USER: Ok.

ASSISTANT: We are sorry to notify you that there is no reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for choosing us, have a nice day.