You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Christine Taylor here. I want to meet my niece on her birthday, please book my ticket from ORD to DEN.

ASSISTANT: Ok, I will help you with that. Please can I know the dates of your journey to book?

USER: My itinerary dates are Mar 16 and Mar 18.

ASSISTANT: Ok, may I know the specification you are looking for?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight available with airfare 100 and the airlines is UA, class is economy. Can I know if the intents provided is ok or not?

USER: I prefer to travel in economy class. Please book my ticket.

ASSISTANT: Ok, the flight 1012 is been confirmed and the depart time is 1:00AM and return time is 23:00PM.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing our agency.