You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Hernandez.

ASSISTANT: How may I help you?

USER: I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from OAK to ORD?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 06//11 and return on 06/13.

ASSISTANT: There is no flight found with your requirements.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Most welcome.