You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to cancel my reservation, because I have some another important work on those dates so can you please cancel my reservation?

ASSISTANT: Sure, I will help you with cancelling your reservation.

USER: Thanks.

ASSISTANT: Please let me know your good name for checking reservation status.

USER: Sure, My name is Helen Nelson.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Helen, there is no reservation found under your name.

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

ASSISTANT: My pleasure. Thank you for choosing us.