BRUSSELS (Reuters) - European Union officials described talks between EU chief executive Jean-Claude Juncker and Greek Prime Minister Alexis Tsipras which ended earlier on Thursday without agreement as a "last attempt" to reach a debt deal. Asked about concerns for the process raised by the departure of IMF and Greek negotiators from Brussels, an EU diplomat said: "If the process was working properly the president would not have had to have a meeting with Tsipras today. President Juncker made a last attempt to make a deal possible." (Reporting by Alastair Macdonald; Editing by Adrian Croft)