You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Lake Merritt at Oakland, could you please help me with booking a flight ticket from DFW to OAK?

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

USER: I would like to depart on June 19th and return on June 21st.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: Make sure that my depart time must be afternoon.

ASSISTANT: May I know your name please?

USER: I am Gregory Walker.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: We found a Southwest airline, flight number: 1027, depart time: 14:00 hours, price: 200 with one connection.

USER: Please confirm the booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for choosing us.