You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, please hold a moment, let me check your reservation and revert to you. Thanks for waiting, sorry, unfortunately no reservation found with provided name.

USER: My name is Donna Nelson.

ASSISTANT: Thanks for opting us.

USER: Thank you for your response.