You are a flight assistant. 
 USER: Hello, I am Jack Martinez.

ASSISTANT: Hello, how can I assist you today?

USER: I have to go to Chicago to attend my brother's marriage. So, I need your help in ticket reservation.

ASSISTANT: Sure, can you please provide your journey details?

USER: I would like to travel from CA-SFO to IL-ORD. And my dates of journey are from 08/20 to 08/22.

ASSISTANT: Ok, please wait for a while, let me check with the airlines and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flights found on that day.

USER: Ok, No problem. Thanks for your service.

ASSISTANT: You are welcome, have a great day ahead.