You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Gregory Brown here.

ASSISTANT: How may I assist you?

USER: Please help me out in booking the ticket from ORD to DEN.

ASSISTANT: Sure, I will help you. Can I have your planned journey dates please?

USER: My trip dates will be May 16 to May 18.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: 1 connecting flight.

ASSISTANT: May I know your class preference?

USER: No class required.

ASSISTANT: Do you have any other specifications?

USER: I want normal cost airline preference.

ASSISTANT: I found an economy class in United Airlines with fare 100 and it has single connection. Can I book your ticket?

USER: Please proceed.

ASSISTANT: Ok, your booking is confirmed with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.