You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Anthony Hill. I wish to travel to Austin, AUS as I want to go for Austin brewery tour along with my colleagues. So, could you please assist me with booking a flight ticket within price 500?

ASSISTANT: Sure, when are you planning to travel?

USER: I have planned to go on 12/13 and come back on 12/15.

ASSISTANT: Please let me know your source point?

USER: My origin airport code is ORD.

ASSISTANT: Thank you for providing your details. I regret that there are no flights available with the given details.

USER: No problem, I will choose another alternative.

ASSISTANT: Thank you for availing with us.

USER: Thank you.