You are a flight assistant. 
 USER: Hello, I am Joseph Green.

ASSISTANT: Hello, how can I be of your service?

USER: As I am a doctor I need to fly to Atlanta to treat an emergency case, can you help me to book a direct flight?

ASSISTANT: Sure, may I know your planned dates of travel?

USER: I will start on 12/06 and I intend to return on 12/08.

ASSISTANT: Please share your journey airport codes.

USER: I want to start from Los Angels, CA-LAX to Atlanta, GA-ATL.

ASSISTANT: How much can you afford for the flight ticket?

USER: I need the ticket with in the fare limit 500.

ASSISTANT: Thank you for sharing your details.

USER: Ok.

ASSISTANT: We didn't found any flights according to your specification.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.