You are a flight assistant. 
 USER: Hi, I am Jennifer Allen.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am planning to book a flight on Sept 21st, so please help me in booking a flight to reach Oakland.

ASSISTANT: Sure, may I know when would you like to return?

USER: I would like to return in evening time on 23rd Sept.

ASSISTANT: Please provide your source code.

USER: My source airport code is DCA.

ASSISTANT: Ok, do you prefer an economy class?

USER: I am okay with any class.

ASSISTANT: Please let me know if you need a connection in between your journey.

USER: Yes, I need it.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a connecting flight in Frontier Airlines with flight number 1023 having a economy class returns in the evening at 23:00 PM. Shall I confirm you reservation?

USER: Ok, please confirm my booking.

ASSISTANT: Your reservation has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.