You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Ruth Edwards here. I am a diamond merchant, I have to open my new branch in Oakland. Could you book my ticket from Las Vegas?

ASSISTANT: Sure Ruth, I will try to help you to book a flight ticket but I need your travelling airport codes to search a flight.

USER: My itinerary dates are 05/24 and 05/26.

ASSISTANT: May I know your travelling airport codes?

USER: My genesis and terminus airport codes are LAS and OAK.

ASSISTANT: I found a direct flight with price 200, shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked with flight-1009.

USER: Thank you.

ASSISTANT: My pleasure.