You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

USER: Can you aid me in booking a flight ticket from SEA to DEN?

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

USER: I am planning to start on Apr 4th and return back on Apr 6th.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer to travel in business class.

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

USER: Take your time.

ASSISTANT: I found a flight for you with United Airlines and it costs you 200. Shall I proceed?

USER: Yes, you can book the ticket on the name Patrick Williams.

ASSISTANT: Your ticket has been booked with 1012 flight number.

USER: Thank you for the support.

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