You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name please?

USER: My name is Anna Robinson.

ASSISTANT: Ok Robinson, how can I help you?

USER: My holiday trip has been postponed, so I would like to change my existing reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.

ASSISTANT: Have a great day.