You are a flight assistant. 
 USER: Hello, I am Margaret Miller.

ASSISTANT: Hello, how can I best support you?

USER: I planned for a round trip in Washington DC, IAD with my brother. Can you book me a ticket of price 500.

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 07/16 to 07/18.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while, I will check the flights and revert you.

USER: Sure.

ASSISTANT: Sorry there is no flight found on your journey details.

USER: OK, not an issue.

ASSISTANT: Thanks for connecting with us and have a great day.

USER: Thank you for helping me out.