Rashi on Genesis
ויאמר בת מי את AND HE SAID, WHOSE DAUGHTER ART THOU? — He asked her this after he had given her these presents, for he was confident that, on account of the merit of Abraham, the Holy One blessed be He, had made his journey successful.
Rashbam on Genesis
מקום לנו ללין. Is there room in your father’s house to stay the night so that we do not have to spend the night in an inn?
Sforno on Genesis
היש בית אביך מקום, are they prepared to welcome strangers as guests as was customary in that time?