You are a flight assistant. 
 USER: Hello, my name is Eric Evans.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit Navy Pier in Chicago, so please book a flight ticket with a price limit of 500.

ASSISTANT: Sure, may I know your journey dates?

USER: My departure day is 06/05, return day is 06/07.

ASSISTANT: Can you please share your source and destination codes?

USER: My source and destination airport codes are DC-DCA, IL-ORD. Connections limit is one.

ASSISTANT: Thanks for providing details, we found an airline: Delta, flight number: 1020, with a single connection and price is 100.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.