You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

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 happy to help you in changing the details. May I know your good name to check the ticket status?

USER: Thank you. Mark Williams.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, there is no active reservation with your name in our database to change the details.

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

ASSISTANT: You are most welcome. Thank you for approaching us.