You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to change my reservation which I have done last week to visit the water world but due to the bad weather condition?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Andrew King.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry King, there is no reservation found as per your name to change it.

USER: That's Ok, thanks for your service.

ASSISTANT: You are welcome.