You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from DFW to IAD?

ASSISTANT: Sure, can you please mention your depart and arrival dates of your journey?

USER: My travel dates are Feb 03 to 05.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer direct flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please help me with your name for booking.

USER: I am Barbara Green.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.