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

ASSISTANT: Hello, how can I help you today?

USER: Please help me in cancelling my recent reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.