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

ASSISTANT: Hello, how may I provide assistance for you?

USER: I have a plan to visit Botanical Garden at Washington on 01/23, can you help me to book a plane under the price limit of 500?

ASSISTANT: Sure, could you please provide me your airport codes?

USER: My source is Austin, TX - AUS. Destination is DC - IAD.

ASSISTANT: Ok, please mention your return date.

USER: My return date is 01/25.

ASSISTANT: Ok, there is a flight with 1 connection and price is 100. Is it ok for you?

USER: Ok.

ASSISTANT: Ok, your booking is confirmed with Frontier airline and flight number is 1024.

USER: Thanks for booking a connected flight ticket.

ASSISTANT: Thanks for reaching us, have a safe journey.