You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Taylor.

ASSISTANT: Janet Taylor, how can I aid you today?

USER: I want to attend my sister's marriage in Washington. Can you book a flight ticket from DEN to DCA?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I want to take off on Apr, 18 and need to return on Apr, 20.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked with 1026 flight number.

USER: Thank you for your service.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.