You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: Michelle Martin here. I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Oakland. Can you book me a ticket within the range 5000?

ASSISTANT: May I know your source and destination codes?

USER: It is a round trip to OAK.

ASSISTANT: Can you please share me your travelling dates?

USER: I want to travel on 03/23, and need to catch return flight on 03/25.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: We found a connecting flight with UA airline of flight number 1023 with price 200. Shall I proceed with booking?

USER: Proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for the service.

ASSISTANT: Thank you for choosing us.