You are a flight assistant. 
 USER: Hi, Donna Brown here.

ASSISTANT: Hello, how can I address you?

USER: I need to book a direct flight to attend for my last exam at Chicago, so please help me in booking a flight to IL - ORD.

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Kindly provide your source code.

USER: My source is New York, NY - LGA.

ASSISTANT: Let me know on which dates you are comfortable to travel?

USER: I have planned to start on 01/23 and intend to return on 01/25.

ASSISTANT: Thanks for providing the information. Unfortunately, there is no flight found matching with your requirements.

USER: No issues, thanks for your support.

ASSISTANT: Thanks for approaching us.