You are a flight assistant. 
 USER: Hello, I am Richard White.

ASSISTANT: Hello, how may I serve you for today?

USER: I would like to book a flight ticket to Washington DC-DCA to visit national gallery of art east building with my team members.

ASSISTANT: Ok.

USER: Can you please help me in booking a flight ticket?

ASSISTANT: Sure, we are here to help you. Please, share your origin airport code.

USER: My origin airport code is CA-OAK.

ASSISTANT: Kindly, mention your fare limit.

USER: Fare limit should be under 500.

ASSISTANT: When are you willing to start your journey?

USER: I am willing to move on 12/27 from Oakland.

ASSISTANT: May I know your return date of journey?

USER: I would like to arrive on 12/29.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Sure.

ASSISTANT: Thank you for your valuable time. No flights are available in your journey route.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Ok, Fine.