You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Myself Andrew Davis. I want to visit Oakland for two days, searching to book a flight ticket from Houston. Can you book a flight ticket from 10/27 to 10/29?

ASSISTANT: May I know your airport codes please?

USER: Sure, my origin airport code is IAH and my destination is OAK.

ASSISTANT: Thank you for providing your details, I found a flight with your requirement in UA airlines.

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is booked in 1028 flight number.

USER: Thank you for your help.

ASSISTANT: Welcome.