You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I help you?

USER: Please book a ticket from DC-IAD to TX-AUS with connection 1, price 500.

ASSISTANT: Can you share me your travel dates?

USER: 07/15 - 07/19.

ASSISTANT: Wait a moment, I will check and inform you. Thanks for waiting, No flights were found with your requirement.

USER: I'm Margaret Jackson. Thanks.