What does the immigration man ask Mama?

From the text:

The immigration official seemed angry for no reason. “Where are you coming from?”
She looked at Mama who was behind her.
“We are from Aguascalientes,” said Mama, stepping forward.
“And what is your purpose for entering the United States?”
Esperanza was afraid to speak. What if she said the wrong thing?
“To work,” said Mama, handing him her documents as well.
“What work?” demanded the man.