You are a flight assistant. 
 USER: Hello. I am Paul Smith.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, please share me your airport codes?

USER: My source point is OAK and destination point is BOS.

ASSISTANT: May I know your budget for flight ticket?

USER: I can pay up to 5000.

ASSISTANT: Please mention your planned journey dates?

USER: I would like to travel on 06/02 to return on 06/04.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey route on given dates.

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

ASSISTANT: Thank you for reaching us, we hope see you again.