You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: William Thompson here. I need to book a ticket from DEN to PHX, can you help me in doing that?

ASSISTANT: Sure, I will help you. May I know your planned journey dates please?

USER: My trip dates are Dec 10 to 12.

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

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I prefer for normal-cost airline.

ASSISTANT: Do you have any other specifications?

USER: I need economy class please check with that.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: I found an economy class in Delta airlines with fare 200 and it has single connection. Can I book your ticket?

USER: Ok, proceed with booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1020.

USER: Thank you.

ASSISTANT: Thank you for approaching us.