You are a flight assistant. 
 USER: Hello, I'm.

ASSISTANT: Hello, how can I assist you for today?

USER: I'm Michael White.

ASSISTANT: Ok, White.

USER: During winter I would like to travel Austin, so can you please book a ticket from IAD to IAS?

ASSISTANT: Can you share your journey dates?

USER: Sure, my journey dates are 04/10 and return on 04/12. Sorry the destination airport code is AUS.

ASSISTANT: White, no flight was found with your requirement. Thank you for reaching us.

USER: That's ok, thank you.