You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: Cynthia Jones here. I would like to meet my cousins at Chicago, please help me in booking a ticket from DEN to ORD.

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: Thank you. My planned travel dates are on Jan 31 and Feb 02.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I would like to depart in the evening.

ASSISTANT: Is there any other preferences?

USER: I prefer economy class for my trip.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.