Scammer details

Report N1
My name is Gianluca and I am italian. I have met Olga in luckylovers. We chatted, emailed and talked by phone more than two months.
Then we decided to meet us. She asked to have our meeting in Prague, and I agreed. She claimed that she didn't have enough money to pay for the ticket and Visa, and I agreed to pay for her trip. I wired to her 500 $ with Western Union. After that, I emailed to the travel agency where we agreed to buy the ticket and to arrange the Visa, but they answered saying that they couldn't see her. In the meantime, I couldn't get answer to my emails and to my phone calls. After some time I could see her in the chat.
She talked with me and she saied that there was some problems. Also about the agency she claimed that there was some problems and that she went in another agency, but she didn't want to say me the details of this other agency. I could already understand to be scammed. I told her that I didn't want to meet her anymore, and I asked to her to send me back the money.
She claimed that she had already payed for Visa. I asked to her to send me back the money deducing the Visa cost. She agreed. But from that moment, she don't aswer to my emails, she don't answer to phone calls, and when I see her in the chat and I try to talk with her, she immediately disconnected me.
Gianluca (Italy)