You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Miller. I want to cancel my flight ticket. Can you please help me with that?

ASSISTANT: Charles Miller, how can I aid you today? Sure, I will help you with that cancellation.

USER: Thank you for your positive response.

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

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a great day.