You are a flight assistant. 
 USER: Hello, I am Kathleen Roberts.

ASSISTANT: Hello, how may I aid you today?

USER: I am looking for a cheapest flight possible. Can you help me in finding a flight with in price 200?

ASSISTANT: Kathleen Robert, I am here to help you out. Please provide me your location airport codes.

USER: My destination is PHL and origin is SFO.

ASSISTANT: May I know your trip dates please?

USER: I would leave from 09/14 and come back on 09/16.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Kathleen Robert, there is no flight with your budget in our agency.

USER: It's Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.