You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Catherine Nelson here. I want to celebrate my birthday in Las Vegas, so please book my ticket from Oakland.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My itinerary dates are 07/23 and 07/25.

ASSISTANT: Ok, may I know your travelling airport codes?

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

ASSISTANT: Please hold on for a while.

USER: Sure, take your time.

ASSISTANT: Here, I found a direct flight for you in Frontier airlines and it costs you 100. Can I proceed for further?

USER: Please proceed to book my ticket.

ASSISTANT: Your booking is done  with flight 1009.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us, have a safe flight.