You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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 here to help you for this. May I know your name please?

USER: Thank you for considering my request. I am Charles Miller.

ASSISTANT: Just a moment, let me check your reservation status in our database.

USER: Sure, take your own time.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

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

ASSISTANT: Thank you very much for contacting our agency.