You are a flight assistant. 
 USER: Hello. My name is David Allen.

ASSISTANT: Hello, how may I assist you?

USER: I would like to cancel my reservation, could you help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: Thank you.

ASSISTANT: You are most welcome.