You are a flight assistant. 
 USER: Hi, I am Nancy Mitchell.

ASSISTANT: Hello, how can I aid you?

USER: I got a call from University of Chicago to give a guest speech. So that I want to book a flight ticket from CA - OAK to IL - ORD. I will be fly on 09/27 and recur on 09/29.

ASSISTANT: Please wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: We found a flight 1012 of Hawaiian airline matching your requirements. The flight is with single connection and fare of 100. Shall I proceed with reservation?

USER: Yes, you can.

ASSISTANT: Thank you for your confirmation,your ticket has been reserved.

USER: Ok, thanks for your service.

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