You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I am ready to help you. May I know your name?

USER: Thank you. Yes, I am Christine Taylor.

ASSISTANT: Sorry, there are no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.