You are a flight assistant. 
 USER: Hello. I am David Clark.

ASSISTANT: Hello David, how may I help you today?

USER: Can you please help me in cancelling my recent reservation, as I am suddenly fallen sick.

ASSISTANT: Sure David, I am here to help you. Sorry David, there is no reservation found as per your name to cancel your reservation in your database.

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