You are a flight assistant. 
 USER: Hello. I am Shirley Miller.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit overview of city at Chicago, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I have planned to travel on 05/14 and 05/16.

ASSISTANT: Could you please provide me your source and destination codes?

USER: Sure, my source is OAK and destination is ORD.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for reaching us.