You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Williams.

ASSISTANT: How may I serve you?

USER: I need to meet my grand parents at Washington, DC-DCA on 01/30.

ASSISTANT: Ok.

USER: Could you please help me with booking a flight ticket?

ASSISTANT: Sure. Where are you want to start your journey?

USER: I want to start on 01/30 and return on 02/01. I want to board from Oakland, CA-OAK.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: There is a flight 1023 in Delta airline and price 100 with a connection. Shall I proceed?

USER: Yes, please proceed with booking.

ASSISTANT: Reservation is done.

USER: Thank you for your assistance.

ASSISTANT: Thank you.