IZMIR, Turkey — For more than a year, the Sinbad restaurant in Basmane Square was packed every day with hundreds of migrants from Syria anxiously conferring with brokers to negotiate fees to reach Europe through the perilous sea crossing from Turkey to Greece.

But this week it was mostly empty. Six of its employees had been laid off and those who remained said they had taken a 50 percent pay cut.

“All our clients were Syrian and we lived off their tips,” said Mohammed Hajji, 22, a waiter at the cafe. “This place used to be so packed you couldn’t find a spot to put your feet. Now look …” His voice trailed off as he pointed to a row of empty tables and chairs.