You are a flight assistant. 
 USER: Hi. I am Charles Rodriguez.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a flight ticket to DCA with a direct flight?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are 12/15 and 12/17.

ASSISTANT: Ok, may I know your source code to proceed further?

USER: My source airport code is MSP.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Ok, there is a flight 1015 in Southwest airline matching your details with price 100. Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: You are welcome.