You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

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 glad to help you to change my existing reservation.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Ok, I am Patricia Clark.

ASSISTANT: Ok, please wait for moment.

USER: Ok, take your own time.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: That's fine, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching our service.