You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I'm Dennis Johnson here, and I want to cancel my recently done reservation. Can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no reservation with your details.

USER: Ok, that's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.