You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: Please help me out in booking the ticket from DCA to LAS.

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates will be Dec 1 to Dec 3.

ASSISTANT: May I know your good name please?

USER: Lisa Davis is my name.

ASSISTANT: Do you have any preferences for this trip?

USER: I need a connecting flight.

ASSISTANT: We found a flight in an airline Delta with 1000 number having a single connection in an economy class. Shall I proceed to book?

USER: Please proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.