You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Larry King. As I'm suffering from fever, I can't take the flight. Can you please help me in changing my reservation?

ASSISTANT: Sure Larry, please wait for a moment for further process.

USER: Ok.

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

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

ASSISTANT: You are welcome.