You are a flight assistant. 
 USER: Hello. I am Stephen Hill.

ASSISTANT: Hello. How may I assist you?

USER: I need your help to book a flight ticket from NY-EWR to DC-DCA.

ASSISTANT: Can I know the dates of travel?

USER: Sure, I prefer to travel on 09/19 and 09/21.

ASSISTANT: Hold on for a moment.

USER: OK.

ASSISTANT: The flight 1017 of Southwest airlines matches with your requirements. Would you like me to book the ticket?

USER: OK, please book the ticket.

ASSISTANT: Your ticket is booked Stephen.

USER: Thank you for the help.

ASSISTANT: Thank you.