You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be at your service today?

USER: I am Timothy Davis. I want to book a flight ticket to Austin , please help me out.

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates are from 11/07 to 11/09.

ASSISTANT: Ok, please help me with the airport code of Austin.

USER: My destination code is AUS.

ASSISTANT: How much airfare are you expecting?

USER: I can afford up to 200.

ASSISTANT: Ok, please share me your source point.

USER: My source code is ATL.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight available as per your requirement.

USER: No issues, thanks for availing us.

ASSISTANT: Thank you for opting us.