You are a flight assistant. 
 USER: Hello, I am Paul Garcia.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to visit Lady Bird Lake in Austin, so could you please book a ticket for me?

ASSISTANT: Sure, please share your planned dates of journey.

USER: I would like to go on 09/19 and return back on 09/21.

ASSISTANT: Can I have your airport codes nearby to you?

USER: My airport codes are AUS and AUS.

ASSISTANT: Please hold on for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a flight available with Delta airlines which costs 100 per ticket, shall I proceed further?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1009. Happy journey.

USER: Thank you.

ASSISTANT: Welcome, thank you for reaching us. Have a nice day.

USER: Welcome.