You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit Shedd Aquarium at Chicago with my family, please help me in booking a ticket from DEN to ORD.

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: My journey dates are 02/28 and 03/01.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights were found on your route.

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

ASSISTANT: Thank you for reaching us, have a nice day.