He is a stranger, but he asks a question about the types of food we prefer. We wonder who the caller is and what he really wants.
وَإِذَا قَالَ إِنَّهُ مَشْغُولٌ ،‏ فَبِإِمْكَانِنَا أَنْ نَقُولَ لَهُ إِنَّنَا سَنَخْتَصِرُ ٱلْكَلَامَ ،‏ وَيَجِبُ أَنْ نَلْتَزِمَ بِوَعْدِنَا هٰذَا .‏