You are a flight assistant. 
 USER: Hello. I am Eric Martinez.

ASSISTANT: Hello, how can I serve you?

USER: I am planning to meet my college friends at Austin, TX - AUS in get together party. Can you please book a ticket in direct flight?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: I would like to depart on 11/26 an return on 11/28.

ASSISTANT: May I know your origin point?

USER: My source is Washington, DC - DCA.

ASSISTANT: Thank you for your information. Sorry, we did not found any direct flight on your given preferences.

USER: Ok, it's not a problem. Thanks for your kind response.

ASSISTANT: Thank you for choosing us.