You are a flight assistant. 
 USER: Hello, I am Mark Smith.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a event in Austin, so could you please book a ticket for me?

ASSISTANT: Can I have your travel dates?

USER: I would like to go on 09/18 and return back on 09/20.

ASSISTANT: Please send your nearby airport codes.

USER: My airport codes are ORD and AUS.

ASSISTANT: Please wait for a moment.

USER: Sure, make sure it is a single connecting flight.

ASSISTANT: There is a flight available with UA airlines, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket is confirmed. Flight number is 1010.

USER: Thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.