You are a flight assistant. 
 USER: Hello. My name is Scott Parker.

ASSISTANT: Hello Scott, how may I serve you today?

USER: Can you help me to book a flight ticket from IL - ORD to GA - ATL?

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

USER: Ok, I need a flight ticket for the dates Dec 17 and Dec 19.

ASSISTANT: May I know your class preference please?

USER: Ok, please proceed with any class flight available. I don't have any specification expect I need a connection flight.

ASSISTANT: Sorry Scott, there is no flight which is a connecting flight for you.

USER: That is ok, thank you for assisting me.

ASSISTANT: You are welcome.