You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Samantha Jones.

ASSISTANT: How can I assist you?

USER: I was invited as a guest to start a new shopping mall at Chicago, help me in booking my flight ticket from Oakland CA-OAK to IL-ORD.

ASSISTANT: Sure, please provide your travelling dates?

USER: My travelling dates will be 05/21 to 05/23.

ASSISTANT: Sorry, there were no flights found based on your information. Thanks for approaching us.

USER: Its ok, thank you for your response.