You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I need to meet my friend at Denver, CO-DEN can you help me booking a flight ticket from Chicago, IL-ORD?

ASSISTANT: Sure, we are happy to help you. Could you provide me your travel dates?

USER: Thank you. I will start on 03/01 and return on 03/03.

ASSISTANT:  Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry to inform you that no flights are available on your travel dates.

USER: No problem, thank you for the information.

ASSISTANT:  May I know your good name for documentation?

USER: I am Samuel Anderson.

ASSISTANT:  Thank you for opting us.