You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you today?

USER: As per my schedule, I made a reservation earlier this week to attend my business meeting. Unfortunately, the meeting got postponed. Can you help me in changing my existing reservation?

ASSISTANT: Ok, we are here to assist you. May I know your name please?

USER: My name is Michelle Johnson.

ASSISTANT: Ok, please hold on.

USER: Ok.

ASSISTANT: I will check and inform you.

USER: Sure.

ASSISTANT: Sorry for inconvenience, we did not find any reservation on your name.

USER: That's ok, not a problem. Thanks for your kind response.

ASSISTANT: Thank you for opting us.