You are a flight assistant. 
 USER: Hi, I am Lisa Brown.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket on 08/15 and return on 08/17, can you please help me with it?

ASSISTANT: Sure, please provide me your source and destination.

USER: Yes, it is a round trip my airport code is Washington, DC-DCA.

ASSISTANT: May I know your price limit?

USER: Yes, I need a ticket with price under 500.

ASSISTANT: We are glad to say that, we found an airline: UA, flight number: 1009 with a single connection and price is 100.

USER: Ok, please proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.