You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Jonathan Jones. I want to fly from ORD to AUS, Can you please book a ticket for me?

ASSISTANT: Sure, may I know your travel dates?

USER: 08/28 to 08/30  and price 200.

ASSISTANT: Ok,please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no flight found with your requirement.

USER: Ok. Thank you.

ASSISTANT: Thanks for reaching us, have a good day.