You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Gregory Williams.

ASSISTANT: May I know your good name please? Ok Williams, how can I help you?

USER: I was fallen ill due to which I would like to cancel my current reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you Williams, there is no reservation found with your name.

USER: That's fine. Thank you for the information.

ASSISTANT: You are welcome. Thank you for choosing us. Have a nice day Williams.

USER: Thank you.