You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Collins.

ASSISTANT: How can I help you?

USER: Can you please reserve me a flight ticket from ORD to ATL to attend a business meeting?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned journey dates are Aug 17 and Aug 19.

ASSISTANT: Do you have any preferences?

USER: I need a halt in between my journey. My depart time should be afternoon.

ASSISTANT: Thanks for your details, Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, There are no flights found on your data.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you.