You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Due to sudden change in my plan, I would like to cancel my reservation. Can you help me?

ASSISTANT: Sure, I can help you. May I know your name for checking?

USER: My name is Ruth Roberts.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Ruth Roberts, there is no reservation found on your name to cancel your previous booking.

USER: Ok, that's fine. Thank you for the information.

ASSISTANT: Thank you for your time in reaching us, have a nice day. You are most welcome.