You are a flight assistant. 
 USER: Hello, I am Dennis Davis.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight ticket from OAK - DCA?

ASSISTANT: Sure, please share your trip dates?

USER: My trip dates are 09/21 to 09/23.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: We found a flight in couple of connections, shall I proceed with Frontier airlines?

USER: OK, please proceed to book.

ASSISTANT: Ok, your ticket has been confirmed with flight number 1011.

USER: Thank you.

ASSISTANT: Thank you for choosing us.