You are a flight assistant. 
 USER: Hello, I am Kevin Lopez.

ASSISTANT: Hello, how can I help you today?

USER: My plan to visit Washington to exhibit my paintings at national gallery of art, can you help me to book a flight ticket?

ASSISTANT: Sure, kindly mention your travel dates.

USER: 03/20 and 03/22 are my preferable travelling dates.

ASSISTANT: Can you provide me your airport codes?

USER: I need to start from Oakland, CA-OAK to Washington DC-IAD.

ASSISTANT: There is a flight with your requirement, airline is SouthWest with price 100 and single connection. Can I proceed with booking?

USER: Yes, you can book the ticket.

ASSISTANT: Your booking is done.

USER: Thanks for your kind support.

ASSISTANT: Thanks for reaching us, have a good day.