You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Harris.

ASSISTANT: How may I help you today?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from SEA to IAD?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: I would like to take off on 11/06 and return on 11/08.

ASSISTANT: Sure, wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for approaching us.

USER: Anyways, thank you for the information.