You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dorothy Campbell. I want to cancel my flight ticket due to some problems so can you please cancel my reservation?

ASSISTANT: Just a moment please.

USER: Ok, thank you for your positive response.

ASSISTANT: I am sorry no reservation found on your name.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.