You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My name is Nicole Nelson. I want to visit Denver to attend a business meeting, can you please help me in booking a ticket with 0 connection?

ASSISTANT: Sure, can I know the details of travel?

USER: I want to travel from ORD to DEN. The dates are from 12/20 to 12/22.

ASSISTANT: I'm sorry, there are no flights matching with your requests.

USER: That's ok.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.