You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Actually my Snookers competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: May I know your name please?

USER: Yes, I am William Turner.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for opting us.