You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to buy a plane ticket. Please help me in that.

ASSISTANT: Sure, we are here to help you. Can you share your airport codes?

USER: Thank you. My source airport code is OAK and destination airport code is DCA.

ASSISTANT: Ok, let me know your trip dates?

USER: My trip dates are from Apr, 09 to Apr, 11.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Do you have any other preferences for your journey?

USER: I prefer an economy class.

ASSISTANT: Ok, can you mention your name please?

USER: My name is Dorothy Wilson.

ASSISTANT: United Airlines has a connection flight with flight number 1010 for fare 100 with an economy class ticket, shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.