You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Joshua Evans. I need to book a flight ticket from Washington to Oakland. Can you please help me to book a flight ticket?

ASSISTANT: Sure, May I know when you are willing to travel?

USER: I am willing to travel on Sept 22 and return on Sept 24.

ASSISTANT: Kindly mention which airport would you prefer in Washington?

USER: My airport code is from DC - DCA.

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

USER: I need a halt in between my journey.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights found on that route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.