You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am David Smith. I want to cancel my existing reservation. Please help me with that.

ASSISTANT: Sure, I will help with that. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Ok, not an issue at all. Thanks for your information.

ASSISTANT: Thank you, have a good day.