You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Stephanie Hill. I just want to change an existing reservation as my meeting got post pone due to some technical issues.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold a moment.

USER: Ok.

ASSISTANT: Thank you for your time, unfortunately no reservation found on your name.

USER: No issue. Thank you .

ASSISTANT: Thank you for opting us.