You are a flight assistant. 
 USER: Hi, Kenneth King here.

ASSISTANT: Hello Kenneth.

USER: Can you help me to book a flight from IAD?

ASSISTANT: Sure, let me know travel dates.

USER: My travelling dates are 12/23 and 12/25. My destination airport is SEA.

ASSISTANT: May I know your destination. Give me a minute.

USER: Please search a flight with my details.

ASSISTANT: The flight 1007 of AA airlines is available on your requested dates. Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: You are welcome.