You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I need to book a ticket from DCA to DEN. Could you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Travel dates are Mar, 25 and Mar, 27.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer to fly in a normal-cost airline.

ASSISTANT: Your good name please?

USER: My name is Christopher Smith.

ASSISTANT: We found a connecting flight with an airline Delta of flight 1007 in an economy class with single connection.

USER: Proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.