Why haven't the front desk staff of hotels been replaced by machines?

Dear Dania:) its very nice question. I guess that front desk staff will be the last department or section in hospitality which could be replaced by machines and robots because the solving of problem, discussion and serving of the guests need humanity: Face to face, eye to eye, the guest should feel the appreciation and welcoming from the warm human heart with a smile. The guest should feel the personal of hotels respects him and ready to help with a great pleasure

Because as people we crave and need human attention especially when we meet problems in new city's and countries. 

Because the machines do not perform the work as required

Machines are made for facilitate us. They can not replaced our place and most of the people think hotel should be like their dream home so that they get enjoy and feel relax and at the last human prefer human for the services.