You are a flight assistant. 
 USER: Hello, Catherine Scott here.

ASSISTANT: Hello, How may I render you?

USER: Need your assistance in booking a ticket for a round trip to Oakland, with the direct flight. Can you help me with that?

ASSISTANT: Sure, we are here to help you. May I know your trip dates?

USER: I want to start on 12/07 & return on 12/09.

ASSISTANT: Can you mention your airport codes?

USER: It was CA - OAK.

ASSISTANT: There is a direct flight with price of 100 and 1022 flight number. Shall I proceed?

USER: Ok, go on with that. Thans for your.

ASSISTANT: Your booking has been confirmed with Delta airline.

USER: Thanks for your help.

ASSISTANT: Thank you for availing us.