You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book flight ticket from DEN to ORD?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned dates to travel are Jan 22 and Jan 24.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a connecting flight to travel.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class for this trip.

ASSISTANT: May I know your name please?

USER: I am Steven Hill.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.