You are a flight assistant. 
 USER: Hi,. HI,.

ASSISTANT: Hello. How can I help you with today?

USER: I am Stephan Young .

ASSISTANT: Stephan, how may I assist you?

USER: I want book a flight ticket .

ASSISTANT: Sure, can you please provide the source and the destination airport codes?

USER: I like to travel from SFO TO ATL.

ASSISTANT: OK, could you please help me with your travelling dates?

USER: My preferred date is on 12/26 to 12/28.

ASSISTANT: OK, let me check that for you. Stephan, there is a flight available at your request with price 200 and the connection limit is 1. Would you like me to confirm the booking?

USER: Sure book my ticket .

ASSISTANT: Your booking is confirmed. Your flight number is 1019 and the airline is Delta. Have a great journey.

USER: Thank you .