You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Smith.

ASSISTANT: How may I assist you?

USER: I need a direct flight to fly from DTW to AUS, can you help me in booking the flight ticket?

ASSISTANT: Sure, may I know your travel dates for booking your ticket?

USER: My travel dates are from 07/28 to 07/30.

ASSISTANT: Sorry there is no flight on your details.

USER: That's ok, no problem. I prefer any other source to reach my destination. Anyway, thank you for your information.

ASSISTANT: Thank you.