You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me to book a business class flight ticket?

ASSISTANT: Sure, I am happy to help you. Can you please let me know your travelling dates?

USER: My travel dates are June 20 and June 22.

ASSISTANT: Kindly mention your respective airport codes.

USER: My airport codes are OAK and LAS.

ASSISTANT: Do you have any lay by in between journey?

USER: Yes, I prefer connecting flight for this trip.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: Can I have your good name?

USER: I am Michael Johnson.

ASSISTANT: Thank you for providing details, unfortunately no flights available on that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.