You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I need to book a flight ticket from IAD to PHL, can you help me in booking a flight ticket?

ASSISTANT: Sure, we are happy to assist you in booking. Can I have your name please?

USER: Sure, Paul Collins here.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my travelling dates are Dec 18 and Dec 20.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer maximum one connection.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we found an economy class ticket providing by Spirit airline with the flight number-1018 and the fare 100. Shall I book the connecting flight?

USER: Yes, you can.

ASSISTANT: Your flight booking is confirmed and ticket has been emailed.

USER: Thank you for your assistance.

ASSISTANT: It's pleasure to serve you.