You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Larry Johnson, could you help me to book a flight ticket?

ASSISTANT: Sure, I can help you with that. Could you please provide the source and the destination airport codes?

USER: I just want to travel from IAD to JFK for a refreshment trip. My dates are 04/15 and 04/17.

ASSISTANT: Larry, can you please help me with the travelling dates? Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: Larry, there is a flight available at your requested dates with price 100. Would you like me to confirm the booking?

USER: That's perfect, please go ahead with booking.

ASSISTANT: Sure. Your booking is confirmed.Your flight number is 1009 and the airline is Frontier. Have a great day.

USER: Thank you for your help in booking a flight ticket.

ASSISTANT: You are welcome.