You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book my ticket from LAX to DCA?

ASSISTANT: Can I have your journey dates?

USER: My trip dates are May 29 and May 31 respectively.

ASSISTANT: Do you need any connection limit?

USER: I prefer for connecting flight to travel.

ASSISTANT: Do you need any other specifications?

USER: I prefer for business class flight.

ASSISTANT: May I know your name for reservation?

USER: Timothy Mitchell here.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for choosing us.