You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: May I know your name?

USER: My name is John Roberts.

ASSISTANT: There is no reservation found under your name to cancel.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.