You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket from IAD to DFW. Could you help me in  booking?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from Feb 05 - 07.

ASSISTANT: Do you need a single connecting flight?

USER: I prefer for direct flight.

ASSISTANT: May I know your other specifications?

USER: I need to travel in economy class.

ASSISTANT: Please, provide your name.

USER: Janet Moore.

ASSISTANT: Sorry, there are no flights available on your request.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.