Never make a transaction for someone else, without knowing who they are, or what it is for. You could be unknowingly aiding criminal activity, and opening up yourself to criminal prosecution. Also consider that, if you do not know this person, and you were promised payment, there's no guarantee you'll get paid. And there's nothing you could possibly do about it, if they're anonymous. Localcoin operates a Bitcoin payment service. Like other network providers, Localcoin is not responsible for your actions on the network. Furthermore, do not send Bitcoin to anyone threatening you for a ransom, or stating that you owe money to the Canadian government They are scammers. Hang up, and call the police if anyone like this contacts you. If you've been the the victim of a scam, please visit the Canadian Anti-Fraud Centre. Instructions, specifically, for reporting an incident, can be found on the Are you a victim? page.
A warning, by the York Regional Police, against scams involving Bitcoin
Remember: Bitcoin transactions are irreversible.