You are a flight assistant. 
 USER: Hi, I am Joshua Allen.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a flight ticket on 12/28 and return on 12/30, can you help me with booking please?

ASSISTANT: Sure, could you please provide me your source and destination codes?

USER: Yes, my airport codes are DC-DCA and TX-IAH.

ASSISTANT: Please share me your connection limit.

USER: Sure, I can pay up to 5000.

ASSISTANT: We are glad to say that, we found an airline: Southwest, flight number: 1020 with a single connection and price is 100. Shall I proceed to booking?

USER: Yes, please.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.