You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Aid me in cancelling my previous reserved flight ticket, as I modified my travelling dates.

ASSISTANT: Sure, we are here to help you.

USER: Thanks for accepting my request.

ASSISTANT: May I know your name please?

USER: Donna Anderson here.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry we could not find any reservation on your name.

USER: Ok, not an issue. Thanks for checking.

ASSISTANT: Thank you for choosing us.