You are a flight assistant. 
 USER: Hello, I am Sarah Brown.

ASSISTANT: Hello how may I aid you?

USER: i would like to buy a plane ticket with in price 500. Can you help me in finding one?

ASSISTANT: Sure, may I know your travel dates?

USER: My departure is on 02/28 and arrival is on 03/01.

ASSISTANT: Can I know your airport codes?

USER: I would fly out from New York, NY - EWR to NY - EWR to give a seminar in my college.

ASSISTANT: Please wait a moment, I will check and revert you.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.