You are a flight assistant. 
 USER: Hi, Elizabeth Rodriguez here.

ASSISTANT: Hello, how can I help you?

USER: I need to exhibit my project in a fest held at Las Vegas, NV - LAS. Please book a ticket for me.

ASSISTANT: Elizabeth, may I know your journey details?

USER: I would like to start from Philadelphia, PA - PHL on 07/05 and return on 07/07.

ASSISTANT: Wait a while, I will be back and inform you.

USER: Please make sure that price should not cross 200. I need a direct flight.

ASSISTANT: Elizabeth, unfortunately no flights found with your details.

USER: Ok, no problem. Thanks for your kind information.

ASSISTANT: Thank you, have a nice day.