You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John Green.

ASSISTANT: How can I assist you for the day?

USER: I would like to travel from DCA to DEN to meet my brother, can you please help me for booking?

ASSISTANT: May I know your travelling dates?

USER: My departure date is on 12/25 and return date is on 12/27.

ASSISTANT: Flight 1003 by Delta airlines is available for you. Can I book it for you?

USER: If flight is with single connection, please proceed for booking.

ASSISTANT: Flight 1003 is having 1 connection and price is 100 only. Your ticket is confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.

ASSISTANT: Have a nice day.