You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Could you please book a flight ticket from LAS to OAK?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are Nov 19 and Nov 21.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Christopher Thomas.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for opting us.