You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Frank Lewis. I am planning to meet my uncle in Charlotte, so please help me in booking a flight ticket within my price limit of 1000.

ASSISTANT: Sure, can you share your trip dates?

USER: I want to fly on 07/03 and return on 07/05.

ASSISTANT: May I know your flying and landing airport codes of journey?

USER: My source is Oakland, CA - OAK and destination code is NC - CLT.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: There is a connecting flight with number 1004 in airline Southwest, the fare is 200. Can I book it?

USER: Don't proceed to booking. I need a direct flight.

ASSISTANT: Sorry, there is no direct flight on your given dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.