You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Cynthia Jones. I want to book a ticket from DEN to ORD, can you help me for that?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My journey dates are Jan 31 to Feb 02.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, not an issue, thank you for the information.

ASSISTANT: Welcome, have a nice day.