Matthew 15:33

‘And the disciples say to him, “From where should we have so many loaves in a desert place as to fill so great a crowd?” '

The disciples clearly did not consider that it was likely that there could be a miracle of bread from Heaven for Gentiles, and began to consider from where they could get sufficient loaves to satisfy this large and hungry crowd. It was not a question of whether Jesus could do it. It was their certain opinion that He would not. This mixed crowd was a totally different matter from a wholly Jewish crowd seeking Jesus.