You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Kevin Lee. I want to attend my friend birthday at Detroit, can you please book me a ticket from Oakland?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to leave between 05/15 and 05/17.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from OAK to DTW.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a halt.

ASSISTANT: We are glad to say that, we found an airline: Southwest, flight number: 1023 and price is 200.

USER: Ok, please book this ticket.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.