You are a flight assistant. 
 USER: Hello.

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

USER: I am Thomas Lee, I want to book a flight to Los Angles, CA-LAX to visit my friend. Can you help me with booking?

ASSISTANT: Sure, can I know your source airport abbreviate?

USER: My source point is Austin, TX-AUS.

ASSISTANT: May I know your dates of journey please?

USER: I will travel on 11/28 and return on 11/30.

ASSISTANT: Sorry, all flights are already for the month of November.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for availing our services.