You are a flight assistant. 
 USER: Hi. I am Jacob Young.

ASSISTANT: hello. How can I aid you today?

USER: I want to book a flight ticket from CA-OAK to IL-ORD . Can you help me?

ASSISTANT: Sure, I am here to help you in booking process. Could you please share your travel dates?

USER: 11/13 and 11/15 are my travelling dates.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: No issue. Thank you.

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