You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Young.

ASSISTANT: How can I help you?

USER: Can you help me in booking a flight ticket from SEA to IAD?

ASSISTANT: Let me know your travelling dates.

USER: I want to travel on 09/06, and return on 09/08.

ASSISTANT: Do you have any preference?

USER: I prefer a economy class with a connecting flight.

ASSISTANT: Found ticket with airline UA for price 100.

USER: Proceed with the booking.

ASSISTANT: Ticket is booked having flight number 1008 in economy class.

USER: Thanks for the service.

ASSISTANT: Thank you.