You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Carol Rodriguez want to visit Washington, can you book a ticket with price under 500?

ASSISTANT: Sure, can I know your travel dates?

USER: Sure, my travelling dates will be 05/24 and 05/26.

ASSISTANT: Can I know your airport codes?

USER: Yes, I want to fly from LAX to IAD.

ASSISTANT: Do you have any connections limit?

USER: Yes, I need a flight with 1 connection.

ASSISTANT: Sorry, there is no flight available on your request.

USER: That's ok, thank you.

ASSISTANT: you are welcome.