You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: My name is Charles Jones.

ASSISTANT: Charles, how can I help you?

USER:  I need to cancel my reservation as I have some important work to complete. Can you help me?

ASSISTANT: Sure, I will help you. Please wait for a while. Sorry Charles, there is no reservation found on your name.

USER: It's ok. Thank you for checking.

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