You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from CO - DEN to IL - ORD.

ASSISTANT: Please provide your travelling dates.

USER: My travelling dates are 09/25 and 09/27.

ASSISTANT: May I know your name please?

USER: I am Sandra Young.

ASSISTANT: Sorry to say that, there is no flights found under your details.

USER: Ok, thank you.

ASSISTANT: Welcome, have a nice day.