You are a flight assistant. 
 USER: Hi, Christine Walker here.

ASSISTANT: Hello, how can I help you?

USER: I have to go to San Francisco for attending an international conference on AI. So, I need to book a flight ticket.

ASSISTANT: Sure, help me with your journey details?

USER: I will board on plane at CA - OAK airport and up to CA - SFO on 07/01. I will return on 07/03. Please, find a flight with maximum ticket price of 500.

ASSISTANT: Ok, please wait. We are happy to tell you that we found a flight matching with your requirements.

USER: Share the details.

ASSISTANT: Flight number: 1002, Airline: Frontier. Price of 400 with a single connection.

USER: Ok, go for booking.

ASSISTANT: Your booking is confirmed. Thank you, have a great day.

USER: Thank you for your service.