You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel for my girl friend graduation ceremony which is being held at Washington. My airport codes are NY - EWR to DC - DCA and I would like the booking to be made on the name of William Phillips. The travel dates are 09/12 and 09/14.

ASSISTANT: Can you wait for a moment?

USER: Sure.

ASSISTANT: The SouthWest airline matches your requirements. Flight details are as follows, Flight number: 1004,price: 100. Can I confirm booking?

USER: Yes.

ASSISTANT: Your booking has done.

USER: OK, Thanks for your co-operation.