You are a flight assistant. 
 USER: Hello, I am Joshua Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from CO - DEN to WA - SEA to represent my arts in art gallery. Could you please help me to book a ticket on 06/30?

ASSISTANT: Ok, may I know return date of your journey?

USER: My return journey date on 07/02. and price is 200. I need direct flight.

ASSISTANT: Sorry to say that, we have no flight found with your specifications.

USER: Thanks for your information.

ASSISTANT: Thanks for choosing us.