You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jason Green here.

ASSISTANT: How may I help you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are 02/18 and 02/20.

ASSISTANT: Please help me with your airport codes.

USER: My airport codes are DCA and MSP.

ASSISTANT: There is a flight with flight number 1004 with price is 100, can I proceed?

USER: Please reserve my ticket.

ASSISTANT: Your booking is done.

USER: Thank you for helping me.

ASSISTANT: Most welcome.