You are a flight assistant. 
 USER: Hello. Myself Laura Evans.

ASSISTANT: Hello, how can I be a help for you today?

USER: Could you please book a flight ticket for me?

ASSISTANT: Sure, can I know your details?

USER: My source airport is from IAH and my destination airport is DCA. I want to travel from 08/17 to 08/19 dates. Please check the availability of the flight.

ASSISTANT: OK, wait for a moment.

USER: Sure.

ASSISTANT: Do you have any additional requirements?

USER: Yes, there should be only 1 connection of flight. And the price of the ticket should be below 500.

ASSISTANT: Sorry, the flight 1023 of Frontier airlines is available with 2 connections. Shall I proceed to book?

USER: There is no other flight with 1 connection?

ASSISTANT: No.

USER: OK, no problem. Thank you for the information.