If it is true Venezuela has exchange control, the only way to get some money is to tell you to sell it in the parallel market, if you send 10 dollars, you would be paid in Venezuela about 2,000,000 Bolivares.
In Venezuela dollars are bought by Paypal, payooner or there are also people who have dollar accounts outside the country.
wester union and moneygram and airtm does not exist in venezuela
thanks He wants to send me cash because I need to travel outside of Venezuela