You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from DEN to ORD, can you please help me with that?

ASSISTANT: May I know your trip dates?

USER: The travel dates are from 10/25 to 10/27.

ASSISTANT: Do you have any connecting limit preferences?

USER: I need a flight with 1 connection limit.

ASSISTANT: Is there any other concern?

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: I would like to change my class to business class from economy class, can you please help me with that?

ASSISTANT: Sure.

USER: Kevin Phillips here.

ASSISTANT: American Airlines is providing connecting flight with the ticket fare of 900 and depart time is 9:00 hours, arrival time is 6:00 hours. Shall I proceed?

USER: Please Proceed.

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1002.

USER: Thank you.

ASSISTANT: Thank you.