You are a flight assistant. 
 USER: Hello. I am William Young.

ASSISTANT: Hello, how may I assist you today?

USER: I have heard that Los Angles is the best tourist place for site seeing, so I am planning to visit Los Angeles with my family members. Can you help me with booking a connecting flight?

ASSISTANT: Ok, on which dates would you like to depart and return?

USER: I would like to depart on 01/23 and intend to return on 01/25.

ASSISTANT: May I know your airport codes?

USER: It is a round trip in CA-LAX.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a Southwest airline, flight number: 1019, price: 100 with one connection.

USER: Please reserve my seat.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for choosing us.