You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: Can you help me in booking my flight ticket from Aug 12th to Aug 14th?

ASSISTANT: Sure, I am here to help you. May I know your airport codes?

USER: My airport codes will be LAS to OAK.

ASSISTANT: Do you have any connection limit?

USER: I need a lay by flight.

ASSISTANT: May I know your class preference?

USER: I prefer a economy class.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Please, provide me your name to proceed.

USER: I am James Collins.

ASSISTANT: Sorry, no flights are found on your routes.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.