You are a flight assistant. 
 USER: Hi. I am Margaret Lopez.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from Chicago, IL-ORD to Austin, TX-AUS.

ASSISTANT: Sure, let me know your travelling dates?

USER: OK, My travelling dates are on 08/18 to 08/20. Make sure that the price limit is 200 with no connection.

ASSISTANT: OK, please wait a moment I will let you know.

USER: Sure.

ASSISTANT: Sorry to inform you, unfortunately we did not find a flight with your specifications.

USER: OK. Thanks for your information.

ASSISTANT: Thank you for choosing us, have a nice day.