You are a flight assistant. 
 USER: Hello. This is Benjamin Parker.

ASSISTANT: Hello, how may I help you?

USER: Assist me in booking flight ticket with a connecting flight, having fare in range 500. Can yo help me in that?

ASSISTANT: Sure, can you please share your trip dates?

USER: Ok, I want to start on 09/30 and return on 10/02.

ASSISTANT: May I know your airport codes please?

USER: Boarding is from CA - OAK, Oakland International airport, and landing at Atlanta, GA - ATL.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your given dates.

USER: That's ok, not an issue. I will choose another alternative for my journey. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.