You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Nancy Roberts, I want to cancel my reservation as my plan to go for shopping got cancelled. Can you help me?

ASSISTANT: Sure, we are here to help you. Sorry, there is no reservation found based on your name.

USER: It's Ok. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.