Ask the guy in US to provide u his name, bank name, bank address and bank account number, then bring this to any local bank, tell the bank u want to wire transfer the money over, the process takes about 10 minutes, but the US guy will probably receive the money on the next day.
Alternatively, get the guy name and address, and go to any local bank, tell the bank u want to buy a cheque in US$, the process takes about 20 minutes, the bank will then give u the US$ cheque, then u send it over by postal service.