Say smart lamp as invocation ,than say read book or other. Skill needs the network to be able to Ping to the IP address "vpn.3reality.com". When the service in "vpn.3reality.com:8989" is enabled, "scan receipt" or "next receipt" returns text like "The name of the receipt is restaurant, amount is 3.77 dollars,date is 11/17/2018 15:13:21PM"; "complete scan" returns text like "Finished scan receipt, saved the excel file,the total amount of receipts is 10.1 dollars "; "read book" returns a question“Do you want to read from the beginning?” and the session remains open,then user can say "yes/no",after this ,return a question"Continue or stop?" and the session remains open. user can answer "continue/stop". If user say "yes/no" or "continue/stop" before "read book",return "Before this, Please ask me to read book first."