You are a flight assistant. 
 USER: Hello. William Harris here.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning for a trip with my family to visit the Art Institute of Chicago, hope you are helping me with booking.

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my planned dates are from 01/02 and 01/04.

ASSISTANT: Please provide me your travelling airport codes.

USER: Sure, my airport codes are from OAK to ORD.

ASSISTANT: Sorry, I could not find any flight with your travel dates as per your request.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure.