You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Oakland as my friend met with an accident, can you book a ticket please?

ASSISTANT: That's so sad to hear, can you please provide your airport codes?

USER: I want to travel from ORD to OAK.

ASSISTANT: May I know your name?

USER: John Hall here.

ASSISTANT: Can you Please provide your travelling dates?

USER: My travelling dates are 12/20 and 12/22.

ASSISTANT: There is a flight with your requirements in Southwest airlines, it has 1 connection.

USER: Book it.

ASSISTANT: Your ticket is booked with 1004 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome.