You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is William Evans. I want to book a flight ticket NY - JFK to WA - SEA. Please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your travel dates?

USER: I prefer to start my journey on 04/18 and return on 04/20.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfortable with any class.

ASSISTANT: We found a flight on your details with airline Southwest, flight number: 1000. Shall I book this ticket?

USER: If it is connecting flight, you can proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for booking.

ASSISTANT: Thank you.