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

ASSISTANT: Hello, how can I help you today?

USER: I am planning to start a new coffee shop at university of taxes, help me in booking my flight ticket with direct flight.

ASSISTANT: Sure, I will help you. May I know your dates of journey please?

USER: I would like to start on 03/13. My returning date is on 03/15.

ASSISTANT: Could you please provide your boarding and landing airport codes?

USER: I would like to start from DC-IAD. My landing airport code is TX-AUS.

ASSISTANT: Please wait for a moment, I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for being patience. We found that, there were no flights available with your requirements.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for contacting us.