Recursive Function Not Wokring

[yougene]

I'm trying to write a program that assigns seats in either first class(seats 1 through 5) or economy class(seats 6 through 10) using the random function. The array seats[ SIZE ] is supposed to hold a value of 0 or 1 to indicate whether it is already taken or not. My problem is when the random seat is already taken I want the function Assignseat() to run itself again recursively to try and find another seat. For some reason it won't run itself recursively. Any ideas?

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 10

int assignSeat( int [], int );

int economyCounter = 0;
int firstCounter = 0;
int main()
{
   srand( time(NULL) );

   int seats[ SIZE ] = { 0 };
   int input;

   while (input != -1) {
      printf("Enter 1 for first class, 2 for economy class or -1 to quit: ");
      scanf("%d", &input);
/*
      if (input == 1 || input == 2)
         assignSeat( seats, input );
*/
      if (input == 1) {
         if (firstCounter < 5)
            printf("You have seat %d in first class\n\n", assignSeat( seats, input ) );
         else
            printf("There are no more first class seats\n");
      }
      else if (input == 2)
         printf("You have seat %d in economy class\n\n", assignSeat( seats, input ) );
      else if (input == -1)
         continue;
      else
         printf("You must enter 1, 2, or -1\n");
   }

   return 0;
}



int assignSeat( int seatNumber[], int class )
{
   int i;
/*
   if (class == 1) {
      i = rand() % 5 + 1;

      if (seatNumber[ i ] != 1) {
         seatNumber[ i ] = 1;

         ++firstCounter;
         printf("counter: %d\n", firstCounter);
      }

      else if (firstCounter < 5)
         assignSeat( seatNumber, class );
   }
*/

   if (class == 1) {
      i = rand() % 6 + 1;
      if (seatNumber[ i ] == 0) {
         seatNumber[ i ] = 1;
         ++firstCounter;
      }
      else
         assignSeat( seatNumber, 1 );
   }

   else if (class == 2) {
      i = rand() % 6 + 5;
      if (seatNumber[ i ] != 1)
         seatNumber[ i ] = 1;
      else
         assignSeat( seatNumber, 2 );
   }

   return i;
}