You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Paul Smith. Due to some personal problem I want to cancel my recent reservation, can you help with this?

ASSISTANT: Sure, please wait for a moment. Sorry, there is no reservation found on your name in our database to cancel.

USER: Sure. That's fine, thanks for your valuable information.

ASSISTANT: You are welcome.