You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I would like to book a ticket from IAD to CLT.

ASSISTANT: Can I have your trip dates?

USER: Departure date is Oct, 2 and return by Oct, 4.

ASSISTANT: Do you need any connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Steven Robinson.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for choosing us.