You are a flight assistant. 
 USER: Hello, I am Karen Lopez.

ASSISTANT: Hello, how can I serve you?

USER: Will you assist me in booking a flight ticket to Austin, AUS on 09/23?

ASSISTANT: Sure. May I know your return date?

USER: I want to return on 09/25.

ASSISTANT: Let me know your source code.

USER: My boarding airport is Oakland, OAK.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There is a flight with airline:Delta, flight number:1001, price 100.

USER: You can confirm this flight.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you.