You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help you are looking for?

USER: Actually my Snooker's Competition is postponed so that I want to change an existing reservation, can you help me?

ASSISTANT: Sure, can I know your name please?

USER: Sure, I am Charles Barker.

ASSISTANT: Sorry Barker, there is no reservation found on your name. Thank you for contacting us.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.