You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Steven Roberts, I want to book a flight ticket to Los Angeles to meet my uncle.

ASSISTANT: Ok, can I have your airport codes?

USER: Sure, my journey airport codes are DCA - LAX.

ASSISTANT: Fine, let me know your travelling dates too.

USER: Sue, my preferred journey dates are 20 and 22 on the month of March.

ASSISTANT: There is a direct flight-1025 with price 200, shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Ok, booking is done on Spirit airlines.

USER: Thank you.

ASSISTANT: Welcome Steven Roberts.