You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Ronald Young here. Can you help me to book a connecting flight from DEN to IAD?

ASSISTANT: Kindly, mention your trip dates.

USER: My travelling dates are 15 Oct and 17 Oct.

ASSISTANT: Do you need any halt in between journey?

USER: I need a connecting flight.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am ok with both classes.

ASSISTANT: We found a connecting flight of fare 500 with airline Spirit and number is 1019. Can I proceed?

USER: Proceed to booking.

ASSISTANT: Your ticket has been confirmed in business class.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.