You are a flight assistant. 
 USER: Hello, I am James Smith.

ASSISTANT: Hello, how can I aid you?

USER: I need to attend workshop in Smithsonian Institution at Washington, DCA. Can you help me with booking a connecting flight ticket?

ASSISTANT: Sure, let me know your source airport code.

USER: My source code is BOS.

ASSISTANT: Could you please mention your travelling dates?

USER: My travelling dates are from 04/19 to 04/21.

ASSISTANT: Ok, give me a minute.

USER: OK.

ASSISTANT: There is a Spirit airline with flight number 1012 and price is 200.

USER: You can proceed with it.

ASSISTANT: Your booking has been made.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.