You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am William Mitchell.

ASSISTANT: Ok.

USER: I would like to book a fight ticket to Denver, CO - DEN to visit the Downtown Aquarium. Can you help me with a connecting flight?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please specify your journey dates?

USER: My trip dates are 03/14 - 03/16.

ASSISTANT: Please provide me your source code?

USER: I want to board from Austin, TX - AUS.

ASSISTANT: We found a Delta airline, flight 1006 with fare 800.

USER: Ok, please proceed. Sorry, please do not proceed. I want a flight within 500.

ASSISTANT: Ok.

USER: Thanks for your help.

ASSISTANT: Thank you for availing us.