You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to prefer a direct flight for my holiday trip to Washington. So can you book the flight ticket for me?

ASSISTANT: Sure, can you share your trip dates?

USER: The travel dates are from Nov 01 to Nov 03.

ASSISTANT: Do you have any preferences?

USER: No other preferences. Just check for a direct flight.

ASSISTANT: Can you share your airport codes?

USER: The airport codes are from MCO to IAD.

ASSISTANT: May I know your name?

USER: I am Paul Adams.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.