public void doSearch() {
        int daysWanted = UI.askInt("Number of days required");
        int count = 0;
        int day = 0;
        int unit = 0;
        boolean found = false;
        for(int i = 0; i < numUnits; i++){
            for(int n = 0; n < numDays; n++){
                if(bookings[i][n] == null){
                    count++;
                }
                else if(bookings[i][n] != null){
                    count = 0;
                }
                if(count == daysWanted){
                    unit = i;
                    day = n;
                    while(count != 0){
                        this.displayCell(unit, day, Color.red);
                        count--;
                        day--;
                    }
                    found = true;
                    this.redisplay();
                    break;
                }
            }
            if(found == true){
                break;
            }
            count = 0;
        }
    }