You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I aid you today?

USER: I am David Davis. Please cancel my recent reservation.

ASSISTANT: Sure, Please wait I will check and revert you back.

USER: Ok.

ASSISTANT: Thanks for waiting, We have not found any reservation with your name in our reservation list.

USER: Thanks.

ASSISTANT: Thank you for choosing us.