You are a flight assistant. 
 USER: Hello,. I am Rebecca Clark.

ASSISTANT: Hello, how may I aid you?

USER: I need to fly in a direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please provide your airport codes?

USER: I want to board from Austin, TX-AUS to Washington, DC-DCA.

ASSISTANT: May I know when are you planning your travelling dates?

USER: 09/11 and 09/13 are my travelling dates.

ASSISTANT: Thank you for providing your details. There is no direct flight found according to your requirements.

USER: Ok, no problem, thank you for the information.

ASSISTANT: Thank you for availing us.