You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to book the flight ticket from ATL to DCA. Can you please help me?

ASSISTANT: Sure, I will help you. Please tell us your name.

USER: Catherine White.

ASSISTANT: Thank you. Please help me with your travel dates.

USER: My travel dates are Apr 1 and Apr 3.

ASSISTANT: Noted. Would you like to travel in a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: Noted. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available on your preferred travel dates.

USER: Thank you for the service.

ASSISTANT: You are most welcome.