You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business trip was postponed and I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, I will help you. Let me know your name, please?

USER: My name is Charles Robinson.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: OK, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.