You are a flight assistant. 
 USER: Hi, I am Susan King.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to visit an international conference about Nature and Environment fair, going to be held at Austin, TX - AUS. Can you help me to book a direct flight?

ASSISTANT: Sure, may I know your price limit?

USER: I have a prime limit of 1000.

ASSISTANT: Can you please provide your journey dates?

USER: I would like to fly on 03/17 and return at 03/19.

ASSISTANT: May I know your source code?

USER: I want to start from TX - HOU.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no flights was found with your given details.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thanks for connecting with us.