Binary Search of 2D array.

[Oalvarez]

Ok so I'm doing this assignment for a class where I have to use a binary search to see if the customer has been assigned a seat this is what I have so far.
It's not working the way I want it to and I don't know why?

void binsearch(Seat seat[][50],int rows,char firstname[],char lastname[],int assigned)
{
	bool found = false;
	int mid,first=0,last=assigned;

	for (int i = 0; i < rows; i++)
	{cout<<'x';
		for(int j=0;j++;j<50)
		{
			while(!found && first <= last)
			{
				mid = (first + last) / 2;
			
				{
					if(stricmp(firstname,seat[i][j].firstname)==0 &&stricmp(lastname,seat[i][j].lastname)==0 )
						found = true;
					else if(stricmp(lastname,seat[i][j].lastname)<0)
					{
						first=mid;
					}
					else if(stricmp(lastname,seat[i][j].lastname)>0)
					{
						last=mid;
					}
					else if(stricmp(lastname,seat[i][j].lastname)== 0 && stricmp(firstname,seat[i][j].firstname)<0)
					{
						first=mid;
					}
					else if(stricmp(lastname,seat[i][j].lastname)== 0 && stricmp(firstname,seat[i][j].firstname)>0)
					{
						last=mid;
					}
				
				}
			}
		}
	}
	if(found)
		cout<<endl<<"Customer "<<firstname<<' '<<lastname<<"was found at: ";

	else
	cout<<"Customer not found"<<endl;
}