You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I provide assistance for you?

USER: I want to visit a national gallery of art at Washington, so can you please help me in booking?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: May I know, from where would you like to fly?

USER: I want to start from Oakland, OAK.

ASSISTANT: When you are planning to travel?

USER: I am planning to travel on 02/20 and return on 02/22.

ASSISTANT: Do you need  a halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Let me know your landing airport code.

USER: Washington airport code is DC-DCA.

ASSISTANT: Your good name please.

USER: My name is Jessica Carter.

ASSISTANT: Thank you for sharing the details, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience. There are no flights found on your route that matches your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.