You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Robert Brown. I want to book a flight ticket to attend Chicago International Auto Show, they are exhibiting more than 400 vehicles from many branded companies. Can you please book a ticket?

ASSISTANT: Sure, we are glad to help you. May I know your airport abbreviations?

USER: I will depart from CA-SFO to IL-ORD.

ASSISTANT: Ok, what are your planned dates?

USER:  My travel dates are 02/04 and 02/06.

ASSISTANT: Ok, is there any preference on connection limit?

USER:  I need a connecting flight.

ASSISTANT: Sorry Robert, there is no flight available on your dates.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for choosing us.