You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please book a flight ticket from IAH to DCA.

ASSISTANT: Sure, can you share your trip dates?

USER: Mar, 2 and Mar, 4 are my travel dates.

ASSISTANT: Do you have any preferences?

USER: I need to travel in connecting flight with economy class.

ASSISTANT: May I know your name?

USER: Gregory Davis here.

ASSISTANT: There is a connecting flight with number 1000 in airline Southwest, the fare is 200 in economy class. Can I book it?

USER: Please book this ticket.

ASSISTANT: Your ticket is reserved, the depart time is 7:00 hours and return time is 20:00 hours.

USER: Thank you.

ASSISTANT: Thank you for reaching us.