You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I aid you?

USER: Can you please help me in booking the flight ticket from OAK to ORD?

ASSISTANT: Sure,may I know your travelling dates?

USER: My travel dates are Dec 9 and Dec 11.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection flight.

ASSISTANT: May I know your name?

USER: Brian Walker.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not an issue, thank you for the information.

ASSISTANT: Thanks for reaching us.