You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: I have planned to cancel my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, we are glad to help you. May I know your good name please?

USER: Stephen Brown.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to cancel.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for choosing us.